["1001 B\u00c0I TO\u00c1N T\u01af DUY 4. B\u00e0i to\u00e1n tr\u1ed3ng c\u00e2y - N\u1ebfu tr\u1ed3ng c\u00e2y \u1edf c\u1ea3 hai \u0111\u1ea7u \u0111\u01b0\u1eddng th\u00ec: s\u1ed1 c\u00e2y = s\u1ed1 kho\u1ea3ng c\u00e1ch + 1 - N\u1ebfu kh\u00f4ng tr\u1ed3ng c\u00e2y \u1edf c\u1ea3 hai \u0111\u1ea7u \u0111\u01b0\u1eddng: s\u1ed1 c\u00e2y = s\u1ed1 kho\u1ea3ng c\u00e1ch - 1 -N\u1ebfu tr\u1ed3ng c\u00e2y tr\u00ean m\u1ed9t \u0111\u01b0\u1eddng kh\u00e9p k\u00edn: s\u1ed1 c\u00e2y = s\u1ed1 kho\u1ea3ng c\u00e1ch. \u00e0 V\u00ed d\u1ee5: Tr\u00ean \u0111o\u1ea1n \u0111\u01b0\u1eddng, c\u00f3 41 c\u1ed9t \u0111\u00e8n \u0111\u01b0\u1ee3c \u0111\u1eb7t c\u00e1ch \u0111\u1ec1u nhau. N\u1ebfu \u0111\u1eb7t c\u1ed9t \u0111\u00e8n \u1edf c\u1ea3 hai \u0111\u1ea7u c\u1ee7a \u0111o\u1ea1n \u0111\u01b0\u1eddng th\u00ec \u0111o\u1ea1n \u0111\u01b0\u1eddng d\u00e0i bao nhi\u00eau m\u00e9t, bi\u1ebft kho\u1ea3ng c\u00e1ch gi\u1eefa m\u1ed7i c\u1ed9t l\u00e0 15m? Gi\u1ea3i S\u1ed1 kho\u1ea3ng c\u00e1ch gi\u1eefa 41 c\u1ed9t \u0111\u00e8n l\u00e0: 41 \u2013 1 = 40 (kho\u1ea3ng c\u00e1ch) \u0110o\u1ea1n \u0111\u01b0\u1eddng d\u00e0i l\u00e0: 15 x 40 = 600 (m) \u0110\u00e1p s\u1ed1: 600m 51","1001 B\u00c0I TO\u00c1N T\u01af DUY B\u1ed9 c\u00e2u h\u1ecfi tr\u1eafc nghi\u1ec7m C\u00e2u 1. Ho\u00e0n th\u00e0nh d\u00e3y s\u1ed1 sau b\u1eb1ng c\u00e1ch ch\u1ecdn s\u1ed1 th\u00edch h\u1ee3p: 2, 10, 18, 26, ____, ____ C\u00e2u 2. Cho d\u00e3y s\u1ed1 sau, x\u00e1c \u0111\u1ecbnh quy lu\u1eadt \u0111\u1ec3 \u0111i\u1ec1n s\u1ed1 \u0111\u00fang v\u00e0o d\u00e3y s\u1ed1: 1, 8, 3, 10, 5, 12, _____ C\u00e2u 3. T\u00ecm s\u1ed1 c\u00f2n thi\u1ebfu trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y: A. 1 B. 2 C. 5 C\u00e2u 4. B\u1ea3ng s\u1ed1 n\u00e0o ph\u00f9 h\u1ee3p? 52","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 5. C\u00f3 bao nhi\u00eau s\u1ed1 \u1edf d\u00f2ng th\u1ee9 s\u00e1u? A B C C\u00e2u 6. T\u00ecm s\u1ed1 c\u00f2n thi\u1ebfu trong d\u00e3y s\u1ed1 sau? 1, 5, 17, 53, ______, 485 C\u00e2u 7. C\u00f3 bao nhi\u00eau c\u1eb7p c\u00f3 t\u1ed5ng l\u00e0 61? A. 30 B. 60 C. 80 C\u00e2u 8. Minh \u0111\u1ecdc quy\u1ec3n s\u00e1ch, ng\u00e0y th\u1ee9 nh\u1ea5t \u0111\u1ecdc \u0111\u01b0\u1ee3c 5 trang, ng\u00e0y th\u1ee9 hai \u0111\u1ecdc \u0111\u01b0\u1ee3c 10 trang, ng\u00e0y th\u1ee9 3 \u0111\u1ecdc \u0111\u01b0\u1ee3c 15 trang. \u0110\u1ebfn ng\u00e0y th\u1ee9 t\u00e1m th\u00ec Minh \u0111\u1ecdc h\u1ebft cu\u1ed1n s\u00e1ch th\u00ec h\u1ecfi quy\u1ec3n s\u00e1ch c\u00f3 bao nhi\u00eau trang? 53","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 9. T\u00ednh t\u1ed5ng c\u1ee7a chu\u1ed7i s\u1ed1: 102 + 104 + 106 +...+ 118 + 120 = ? C\u00e2u 10. D\u00e3y s\u1ed1 n\u00e0o c\u00f3 t\u1ed5ng l\u00e0: A B C C\u00e2u 11. T\u00ecm s\u1ed1 h\u1ea1ng 28 trong d\u00e3y s\u1ed1: 2, 4, 6, 8, 2, 4, 6, 8, 2, 4, 6, 8, \u2026 C\u00e2u 12. M\u1ed9t c\u1eeda h\u00e0ng g\u1ea5u b\u00f4ng b\u00e1n \u0111\u01b0\u1ee3c nh\u01b0 sau: Ng\u00e0y 1 b\u00e1n \u0111\u01b0\u1ee3c 3 g\u1ea5u b\u00f4ng; Ng\u00e0y 2 b\u00e1n \u0111\u01b0\u1ee3c 6 g\u1ea5u b\u00f4ng; Ng\u00e0y 3 b\u00e1n \u0111\u01b0\u1ee3c 9 g\u1ea5u b\u00f4ng ..... H\u1ecfi c\u1eeda h\u00e0ng \u0111\u00f3 s\u1ebd b\u00e1n \u0111\u01b0\u1ee3c t\u1ea5t c\u1ea3 bao nhi\u00eau g\u1ea5u b\u00f4ng v\u00e0o \u0111\u1ebfn ng\u00e0y 10? A B C 54","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 13. \u0110\u1ed9i thi v\u1ebd c\u1ee7a tr\u01b0\u1eddng c\u00f3 45 b\u1ea1n. N\u1eef nhi\u1ec1u h\u01a1n nam 7 b\u1ea1n. H\u1ecfi c\u00f3 bao nhi\u00eau b\u1ea1n n\u1eef trong \u0111\u1ed9i thi v\u1ebd? C\u00e2u 14. Trong trang tr\u1ea1i, ng\u01b0\u1eddi n\u00f4ng d\u00e2n tr\u1ed3ng 235 c\u00e2y t\u00e1o v\u00e0 c\u00e2y cam. S\u1ed1 c\u00e2y cam nhi\u1ec1u h\u01a1n s\u1ed1 c\u00e2y t\u00e1o l\u00e0 35 c\u00e2y. H\u1ecfi c\u00f3 bao nhi\u00eau c\u00e2y t\u00e1o v\u00e0 c\u00e2y c\u00e2y cam? A. 90 c\u00e2y t\u00e1o; 145 c\u00e2y cam B. 100 c\u00e2y t\u00e1o; 135 c\u00e2y cam C\u00e2u 15. Anna v\u00e0 Mary c\u00f3 t\u1ed5ng c\u1ed9ng 50 b\u00f4ng hoa. S\u1ed1 b\u00f4ng hoa c\u1ee7a Anna nhi\u1ec1u h\u01a1n c\u1ee7a Mary n\u00ean Anna cho Mary 5 b\u00f4ng \u0111\u1ec3 s\u1ed1 b\u00f4ng c\u1ee7a hai b\u1ea1n b\u1eb1ng nhau. H\u1ecfi ban \u0111\u1ea7u m\u1ed7i b\u1ea1n c\u00f3 bao nhi\u00eau b\u00f4ng hoa? 55","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 16. Mina v\u00e0 Gina mua t\u1ed5ng c\u1ed9ng 30 quy\u1ec3n s\u00e1ch. N\u1ebfu Mina cho Gina 6 quy\u1ec3n s\u00e1ch th\u00ec Mina s\u1ebd c\u00f3 \u00edt h\u01a1n Gina 2 quy\u1ec3n s\u00e1ch. H\u1ecfi l\u00fac \u0111\u1ea7u m\u1ed7i b\u1ea1n mua bao nhi\u00eau quy\u1ec3n s\u00e1ch? C\u00e2u 17. Gi\u1ecf s\u1ed1 1 c\u00f3 53 qu\u1ea3 \u0111\u00e0o. Gi\u1ecf s\u1ed1 2 c\u00f3 85 qu\u1ea3 \u0111\u00e0o. H\u1ecfi c\u1ea7n ph\u1ea3i chuy\u1ec3n bao nhi\u00eau qu\u1ea3 \u0111\u00e0o t\u1eeb gi\u1ecf s\u1ed1 1 sang gi\u1ecf s\u1ed1 2 \u0111\u1ec3 s\u1ed1 \u0111\u00e0o trong gi\u1ecf s\u1ed1 2 nhi\u1ec1u g\u1ea5p 5 l\u1ea7n gi\u1ecf s\u1ed1 1? C\u00e2u 18. Shilla c\u00f3 55 \u0111\u00f4-la. Eric c\u00f3 86 \u0111\u00f4-la. H\u1ecfi Shilla ph\u1ea3i \u0111\u01b0a cho Eric bao nhi\u00eau ti\u1ec1n \u0111\u1ec3 s\u1ed1 ti\u1ec1n c\u1ee7a Eric nhi\u1ec1u g\u1ea5p 2 l\u1ea7n s\u1ed1 ti\u1ec1n c\u1ee7a Shilla? 56","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 19. C\u00e2y xanh \u0111\u01b0\u1ee3c tr\u1ed3ng d\u1ecdc theo m\u1ed9t con \u0111\u01b0\u1eddng d\u00e0i 10m. Kho\u1ea3ng c\u00e1ch gi\u1eefa 2 c\u00e2y l\u00e0 2m. H\u1ecfi c\u00f3 th\u1ec3 tr\u1ed3ng bao nhi\u00eau c\u00e2y tr\u00ean con \u0111\u01b0\u1eddng \u0111\u00f3 bi\u1ebft c\u1ea3 hai \u0111\u1ea7u \u0111o\u1ea1n \u0111\u01b0\u1eddng \u0111\u1ec1u tr\u1ed3ng c\u00e2y? C\u00e2u 20. Tr\u00ean con \u0111\u01b0\u1eddng d\u00e0i 400m c\u00e1c c\u00e2y \u0111\u01b0\u1ee3c tr\u1ed3ng v\u1edbi kho\u1ea3ng c\u00e1ch 5m. H\u1ecfi c\u00f3 bao nhi\u00eau c\u00e2y \u0111\u01b0\u1ee3c tr\u1ed3ng tr\u00ean con \u0111\u01b0\u1eddng \u0111\u00f3, bi\u1ebft c\u00e2y \u0111\u01b0\u1ee3c tr\u1ed3ng t\u1ea1i c\u1ea3 hai \u0111\u1ea7u \u0111o\u1ea1n \u0111\u01b0\u1eddng? A. 101 c\u00e2y B. 91 c\u00e2y C. 81 c\u00e2y C\u00e2u 21. David d\u00f9ng c\u00e1c \u0111\u1ed3ng xu \u0111\u1ec3 x\u1ebfp th\u00e0nh h\u00ecnh tam gi\u00e1c. M\u1ed7i g\u00f3c c\u1ee7a tam gi\u00e1c c\u00f3 m\u1ed9t \u0111\u1ed3ng xu. H\u1ecfi David c\u1ea7n d\u00f9ng bao nhi\u00eau \u0111\u1ed3ng xu n\u1ebfu m\u1ed7i c\u1ea1nh c\u1ee7a tam gi\u00e1c c\u00f3 5 \u0111\u1ed3ng xu? 57","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 22. John m\u1ea5t 10 ph\u00fat \u0111\u1ec3 c\u01b0a m\u1ed9t kh\u00fac g\u1ed7 th\u00e0nh 3 \u0111o\u1ea1n c\u00f3 chi\u1ec1u d\u00e0i b\u1eb1ng nhau. H\u1ecfi John ph\u1ea3i m\u1ea5t bao l\u00e2u \u0111\u1ec3 c\u01b0a kh\u00fac g\u1ed7 th\u00e0nh 9 \u0111o\u1ea1n b\u1eb1ng nhau? C\u00e2u 23. Hai qu\u1ea3 m\u0103ng c\u1ee5t c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 60g. 2 qu\u1ea3 cam c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng b\u1eb1ng 4 qu\u1ea3 m\u0103ng c\u1ee5t. H\u1ecfi kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a 1 qu\u1ea3 cam l\u00e0 bao nhi\u00eau gam? C\u00e2u 24. T\u00ecm gi\u00e1 ti\u1ec1n c\u1ee7a b\u00e1nh kem, bi\u1ebft: A. 9$ B. 15$ C. 8$ 58","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 25. 2 qu\u1ea3 b\u00f3ng chuy\u1ec1n gi\u1ed1ng nhau v\u00e0 3 qu\u1ea3 b\u00f3ng r\u1ed5 c\u00f9ng lo\u1ea1i c\u00f3 gi\u00e1 200$. 4 qu\u1ea3 b\u00f3ng chuy\u1ec1n v\u00e0 5 qu\u1ea3 b\u00f3ng r\u1ed5 c\u00f9ng lo\u1ea1i c\u00f3 gi\u00e1 360$. H\u1ecfi m\u1ed7i qu\u1ea3 b\u00f3ng r\u1ed5 c\u00f3 gi\u00e1 bao nhi\u00eau? C\u00e2u 26. 3 qu\u1ea3 \u1ed5i v\u00e0 3 qu\u1ea3 l\u00ea c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 460g. 3 qu\u1ea3 \u1ed5i v\u00e0 6 qu\u1ea3 l\u00ea t\u01b0\u01a1ng t\u1ef1 c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 550g. H\u1ecfi m\u1ed9t qu\u1ea3 l\u00ea n\u1eb7ng bao nhi\u00eau gam? C\u00e2u 27. H\u1ecfi kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a m\u1ed9t qu\u1ea3 m\u00e3ng c\u1ea7u l\u00e0 bao nhi\u00eau? A. 320g B. 480g C. 500g 59","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 28. Chi\u1ebfc \u0111\u1ed3ng h\u1ed3 qu\u1ea3 l\u1eafc l\u00fac 4 gi\u1edd \u0111\u00e1nh 4 ti\u1ebfng chu\u00f4ng trong 20 gi\u00e2y. H\u1ecfi l\u00fac 7 gi\u1edd \u0111\u00e1nh 7 ti\u1ebfng chu\u00f4ng trong bao nhi\u00eau gi\u00e2y? C\u00e2u 29. M\u1ed7i c\u1ea1nh c\u1ee7a s\u00e2n \u0111\u1ea5u c\u1ea7u l\u00f4ng \u0111\u01b0\u1ee3c c\u1eafm 20 l\u00e1 c\u1edd. T\u1ea1i m\u1ed7i g\u00f3c c\u00f3 m\u1ed9t l\u00e1 c\u1edd. H\u1ecfi c\u00f3 t\u1ed5ng c\u1ed9ng bao nhi\u00eau l\u00e1 c\u1edd \u0111\u01b0\u1ee3c c\u1eafm tr\u00ean s\u00e2n? 60","1001 B\u00c0I TO\u00c1N T\u01af DUY \u0110\u00e1p \u00e1n ch\u1ee7 \u0111\u1ec1 5 1A, 2C, 3B, 4A, 5C, 6C, 7A, 8B, 9D, 10C, 11D, 12C, 13C, 14B, 15A, 16C, 17C, 18B, 19A, 20C, 21A, 22A, 23D, 24B, 25C, 26B, 27B, 28B, 29B. T\u1ea3i App Hoc247 Kids \u0111\u1ec3 xem video h\u01b0\u1edbng d\u1eabn gi\u1ea3i chi ti\u1ebft nh\u00e9! 61","1001 B\u00c0I TO\u00c1N T\u01af DUY Ch\u1ee7 \u0111\u1ec1 6: Ph\u00e9p nh\u00e2n. T\u00ednh ng\u01b0\u1ee3c. B\u00e0i to\u00e1n v\u1ec1 tu\u1ed5i I. Ki\u1ebfn th\u1ee9c tr\u1ecdng t\u00e2m 1. \u0110\u1ebfm \u0111o\u1ea1n th\u1eb3ng, \u0111\u1ebfm h\u00ecnh. a) \u0110\u1ebfm \u0111o\u1ea1n th\u1eb3ng: \u0110\u1ebfm s\u1ed1 \u0111o\u1ea1n th\u1eb3ng d\u1ef1a v\u00e0o s\u1ed1 \u0111i\u1ec3m. S\u1ed1 \u0111o\u1ea1n th\u1eb3ng = n x (n \u2013 1) : 2 Trong \u0111\u00f3: n l\u00e0 s\u1ed1 \u0111i\u1ec3m. \u00e0 V\u00ed d\u1ee5: C\u00f3 bao nhi\u00eau \u0111o\u1ea1n th\u1eb3ng kh\u00f4ng b\u1eb1ng nhau trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y? Gi\u1ea3i Trong h\u00ecnh \u1ea3nh tr\u00ean c\u00f3 5 \u0111i\u1ec3m. S\u1ed1 \u0111o\u1ea1n th\u1eb3ng = 5 x (5 -1) : 2 = 10 V\u1eady c\u00f3 10 \u0111o\u1ea1n th\u1eb3ng kh\u00f4ng b\u1eb1ng nhau. b) \u0110\u1ebfm h\u00ecnh: \u0110\u00e1nh s\u1ed1 th\u1ee9 t\u1ef1 cho c\u00e1c h\u00ecnh nh\u1ecf. Sau \u0111\u00f3 \u0111\u1ebfm s\u1ed1 h\u00ecnh \u0111\u01a1n, ti\u1ebfp \u0111\u1ebfn l\u00e0 \u0111\u1ebfm c\u00e1c h\u00ecnh \u0111\u01b0\u1ee3c gh\u00e9p t\u1eeb 2, 3, 4, 5, \u2026 h\u00ecnh nh\u1ecf. R\u1ed3i c\u1ed9ng l\u1ea1i. \u00e0 V\u00ed d\u1ee5: \u0110\u1ebfm s\u1ed1 h\u00ecnh tam gi\u00e1c trong h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y. 62","1001 B\u00c0I TO\u00c1N T\u01af DUY Gi\u1ea3i Tam gi\u00e1c \u0111\u01a1n: 1, 2, 3 Tam gi\u00e1c gh\u00e9p t\u1eeb 2 h\u00ecnh: 1 + 2; 2 + 3 Tam gi\u00e1c gh\u00e9p t\u1eeb 3 h\u00ecnh: 1 + 2 + 3 V\u1eady c\u00f3 t\u1ea5t c\u1ea3 6 h\u00ecnh tam gi\u00e1c 2. T\u00ednh ng\u01b0\u1ee3c - M\u1ed9t s\u1ed1 ph\u00e9p t\u00ednh ng\u01b0\u1ee3c c\u1ee7a nhau l\u00e0: + Ph\u00e9p t\u00ednh ng\u01b0\u1ee3c c\u1ee7a ph\u00e9p c\u1ed9ng + (th\u00eam v\u00e0o, t\u0103ng l\u00ean) l\u00e0 ph\u00e9p tr\u1eeb - (b\u1edbt \u0111i, gi\u1ea3m \u0111i) + Ph\u00e9p t\u00ednh ng\u01b0\u1ee3c c\u1ee7a ph\u00e9p tr\u1eeb - l\u00e0 ph\u00e9p c\u1ed9ng + + Ph\u00e9p t\u00ednh ng\u01b0\u1ee3c c\u1ee7a ph\u00e9p nh\u00e2n x (g\u1ea5p bao nhi\u00eau l\u1ea7n) l\u00e0 ph\u00e9p chia : (gi\u1ea3m \u0111i bao nhi\u00eau l\u1ea7n) + Ph\u00e9p t\u00ednh ng\u01b0\u1ee3c c\u1ee7a ph\u00e9p chia : l\u00e0 ph\u00e9p nh\u00e2n x \u00e0 V\u00ed d\u1ee5: \u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o d\u1ea5u ch\u1ea5m h\u1ecfi. Gi\u1ea3i \u0110\u1ec3 t\u00ecm d\u1ea5u ch\u1ea5m h\u1ecfi ta th\u1ef1c hi\u1ec7n tinh ng\u01b0\u1ee3c t\u1eeb sau v\u1ec1 tr\u01b0\u1edbc v\u00e0 c\u00f3 k\u1ebft qu\u1ea3 nh\u01b0 sau: 63","1001 B\u00c0I TO\u00c1N T\u01af DUY 3. B\u00e0i to\u00e1n v\u1ec1 tu\u1ed5i + D\u00f9ng ph\u01b0\u01a1ng ph\u00e1p s\u01a1 \u0111\u1ed3 \u0111o\u1ea1n th\u1eb3ng \u0111\u1ec3 gi\u1ea3i. + Hi\u1ec7u s\u1ed1 tu\u1ed5i c\u1ee7a 2 ng\u01b0\u1eddi kh\u00f4ng thay \u0111\u1ed5i theo th\u1eddi gian. \u00e0 V\u00ed d\u1ee5: Tu\u1ed5i c\u1ee7a Hoa n\u0103m nay l\u00e0 8 tu\u1ed5i, 3 n\u0103m sau, Hoa k\u00e9m anh c\u1ee7a m\u00ecnh 4 tu\u1ed5i. H\u1ecfi n\u0103m nay anh c\u1ee7a Hoa bao nhi\u00eau tu\u1ed5i? Gi\u1ea3i V\u00ec hi\u1ec7u s\u1ed1 tu\u1ed5i c\u1ee7a hai ng\u01b0\u1eddi kh\u00f4ng thay \u0111\u1ed5i, n\u00ean anh h\u01a1n Hoa 4 tu\u1ed5i. S\u1ed1 tu\u1ed5i anh c\u1ee7a Hoa n\u0103m nay l\u00e0: 8 + 4 = 12 (tu\u1ed5i) \u0110\u00e1p s\u1ed1: 12 tu\u1ed5i 64","1001 B\u00c0I TO\u00c1N T\u01af DUY B\u1ed9 c\u00e2u h\u1ecfi tr\u1eafc nghi\u1ec7m C\u00e2u 1. C\u00f3 bao nhi\u00eau \u0111o\u1ea1n th\u1eb3ng c\u00f3 chi\u1ec1u d\u00e0i kh\u00e1c nhau? C\u00e2u 2. C\u00f3 bao nhi\u00eau \u0111o\u1ea1n th\u1eb3ng c\u00f3 chi\u1ec1u d\u00e0i kh\u00e1c nhau? C\u00e2u 3. C\u00f3 bao nhi\u00eau h\u00ecnh tam gi\u00e1c? C\u00e2u 4. C\u00f3 bao nhi\u00eau h\u00ecnh tam gi\u00e1c? 65","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 5. C\u00f3 bao nhi\u00eau h\u00ecnh vu\u00f4ng? C\u00e2u 6. C\u00f3 bao nhi\u00eau h\u00ecnh ch\u1eef nh\u1eadt? C\u00e2u 7. T\u00ednh nhanh: 42 + 69 + 18 + 31 = ? C\u00e2u 8. T\u00ednh nhanh 66","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 8. T\u00ednh nhanh: 624 + 24 + 176 = ? C\u00e2u 10. T\u00ednh nhanh: 24 + 28 + 18 C\u00e2u 11. T\u00ednh nhanh: C\u00e2u 12. T\u00ednh nhanh: 40 x 6 x 25 = ? 67","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 13. T\u00ednh nhanh: C\u00e2u 14. T\u00ednh nhanh: 624 - (324 - 42) = ? C\u00e2u 15. T\u00ednh nhanh: C\u00e2u 16. T\u00ednh nhanh: 42 x 98 = ? 68","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 17. T\u00ednh nhanh: C\u00e2u 18. T\u00ecm, bi\u1ebft: A. 800 B. 80 C. 8000 C\u00e2u 19. T\u00ednh nhanh: 24 x 125 = ? C\u00e2u 20. T\u00ednh nhanh: 69","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 21. T\u00ednh nhanh: C\u00e2u 22. T\u00ednh nhanh: 28 x 250 = ? C\u00e2u 23. N\u0103m nay Shane 8 tu\u1ed5i, m\u1eb9 c\u1ee7a b\u1ea1n \u1ea5y 38 tu\u1ed5i. H\u1ecfi c\u00e1ch \u0111\u00e2y bao nhi\u00eau n\u0103m n\u1eefa th\u00ec tu\u1ed5i m\u1eb9 g\u1ea5p 6 l\u1ea7n tu\u1ed5i c\u1ee7a Shane? C\u00e2u 24. Hai n\u0103m tr\u01b0\u1edbc m\u1eb9 h\u01a1n Nam 24 tu\u1ed5i v\u00e0 m\u1eb9 29 tu\u1ed5i. H\u1ecfi n\u0103m nay Nam bao nhi\u00eau tu\u1ed5i? 70","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 25. N\u0103m nay Anan 7 tu\u1ed5i, tu\u1ed5i b\u1ed1 g\u1ea5p 5 l\u1ea7n tu\u1ed5i AnAn. H\u1ecfi n\u0103m nay b\u1ed1 AnAn bao nhi\u00eau tu\u1ed5i? C\u00e2u 26. Tu\u1ed5i c\u1ee7a Mai n\u0103m nay l\u00e0 7 tu\u1ed5i, 3 n\u0103m sau, tu\u1ed5i c\u1ee7a anh Mai h\u01a1n Mai 2 tu\u1ed5i. H\u1ecfi n\u0103m nay anh c\u1ee7a Mai bao nhi\u00eau tu\u1ed5i? C\u00e2u 27. Nam n\u0103m nay 8 tu\u1ed5i, em 2 tu\u1ed5i. H\u1ecfi em s\u1ebd bao nhi\u00eau tu\u1ed5i khi t\u1ed5ng tu\u1ed5i c\u1ee7a hai anh em l\u00e0 24? C\u00e2u 28. M\u1eb9 h\u01a1n Lan 24 tu\u1ed5i, bi\u1ebft tu\u1ed5i c\u1ee7a m\u1eb9 g\u1ea5p 4 l\u1ea7n tu\u1ed5i c\u1ee7a Lan. H\u1ecfi m\u1eb9 v\u00e0 Lan bao nhi\u00eau tu\u1ed5i? 71","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 29. N\u0103m nay Josh 16 tu\u1ed5i, em Josh n\u0103m nay 10 tu\u1ed5i. H\u1ecfi sau bao nhi\u00eau n\u0103m n\u1eefa, t\u1ed5ng tu\u1ed5i c\u1ee7a hai ng\u01b0\u1eddi l\u00e0 42 tu\u1ed5i? C\u00e2u 30. Lan n\u0103m nay 11 tu\u1ed5i, em Lan n\u0103m nay 9 tu\u1ed5i. H\u1ecfi hai ch\u1ecb Lan s\u1ebd bao nhi\u00eau tu\u1ed5i khi t\u1ed5ng tu\u1ed5i c\u1ee7a 2 ch\u1ecb em l\u00e0 42 tu\u1ed5i? C\u00e2u 31. Nh\u00e0 c\u1ee7a Anan c\u00f3 3 th\u00e0nh vi\u00ean g\u1ed3m b\u1ed1, m\u1eb9 v\u00e0 Anan. T\u1ed5ng tu\u1ed5i c\u1ee7a c\u1ea3 3 ng\u01b0\u1eddi l\u00e0 70 tu\u1ed5i, h\u1ecfi sau bao nhi\u00eau n\u0103m n\u1eefa th\u00ec t\u1ed5ng tu\u1ed5i c\u1ee7a ba ng\u01b0\u1eddi s\u1ebd l\u00e0 94 tu\u1ed5i? 72","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u32. T\u1ed5ng tu\u1ed5i c\u1ee7a m\u1eb9 v\u00e0 Andy l\u00e0 42 tu\u1ed5i, ch\u1ecb g\u00e1i Andy \u00edt h\u01a1n m\u1eb9 29 tu\u1ed5i, Andy l\u1ea1i \u00edt h\u01a1n ch\u1ecb 3 tu\u1ed5i. H\u1ecfi Andy v\u00e0 ch\u1ecb m\u1ed7i ng\u01b0\u1eddi bao nhi\u00eau tu\u1ed5i? C\u00e2u 33. T\u1ed5ng tu\u1ed5i c\u1ee7a b\u1ed1 v\u00e0 m\u1eb9 l\u00e0 81 tu\u1ed5i, sau 4 n\u0103m n\u1eefa, b\u1ed1 h\u01a1n m\u1eb9 3 tu\u1ed5i. H\u1ecfi n\u0103m nay, b\u1ed1 v\u00e0 m\u1eb9 m\u1ed7i ng\u01b0\u1eddi bao nhi\u00eau tu\u1ed5i? C\u00e2u 34. S\u1ed1 c\u1ea7n t\u00ecm l\u00e0: C. 32 A. 11 B. 21 73","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 35. S\u1ed1 c\u1ea7n t\u00ecm l\u00e0: A. 24 B. 20 C. 28 C\u00e2u 36. S\u1ed1 c\u1ea7n t\u00ecm l\u00e0: A. 5 B. 7 C. 6 C\u00e2u 37. Lan c\u00f3 m\u1ed9t s\u1ed1 k\u1eb9o, bi\u1ebft r\u1eb1ng khi Lan cho em n\u1eeda s\u1ed1 k\u1eb9o, r\u1ed3i Lan cho b\u00e1c Hu\u1ec7 2 vi\u00ean k\u1eb9o, th\u00ec Lan c\u00f2n l\u1ea1i 6 vi\u00ean. H\u1ecfi l\u00fac \u0111\u1ea7u Lan c\u00f3 bao nhi\u00eau vi\u00ean k\u1eb9o? C\u00e2u 38. M\u1eb9 cho Jack m\u1ed9t s\u1ed1 ti\u1ec1n. Jack mua k\u1eb9o h\u1ebft 3$, mua b\u00fat h\u1ebft 7$, v\u1ec1 nh\u00e0 Jack \u0111\u01b0\u1ee3c b\u1ed1 cho th\u00eam 9$, th\u00ec l\u00fac n\u00e0y Jack c\u00f3 18$. H\u1ecfi, m\u1eb9 cho Jack bao nhi\u00eau ti\u1ec1n? 74","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 39. Tr\u1eeb m\u1ed9t s\u1ed1 cho 4. Nh\u00e2n hi\u1ec7u s\u1ed1 nh\u1eadn \u0111\u01b0\u1ee3c v\u1edbi 2. Chia t\u00edch \u0111\u00f3 cho 8. Th\u01b0\u01a1ng s\u1ed1 cu\u1ed1i c\u00f9ng v\u1eabn l\u00e0 5. H\u1ecfi \u0111\u00f3 l\u00e0 s\u1ed1 n\u00e0o? C\u00e2u 40. Minh cho Nam m\u1ed9t s\u1ed1 vi\u00ean bi, Lan cho th\u00eam Nam 20 vi\u00ean bi, r\u1ed3i Nam cho em m\u1ed9t n\u1eeda s\u1ed1 bi, th\u00ec Nam c\u00f2n l\u1ea1i 32 vi\u00ean bi. H\u1ecfi Minh cho Nam bao nhi\u00eau vi\u00ean bi? C\u00e2u 41. C\u00f3 24 con chim s\u1ebb \u0111\u1eadu tr\u00ean 2 c\u00e0nh c\u00e2y. 6 con bay t\u1eeb c\u00e0nh th\u1ee9 nh\u1ea5t sang c\u00e0nh th\u1ee9 hai. 8 con l\u1ea1i bay t\u1eeb c\u00e0nh th\u1ee9 hai sang c\u00e0nh th\u1ee9 nh\u1ea5t. Khi \u0111\u00f3 s\u1ed1 con chim tr\u00ean hai c\u00e0nh c\u00e2y b\u1eb1ng nhau. H\u1ecfi l\u00fac \u0111\u1ea7u m\u1ed7i c\u00e0nh c\u00e2y c\u00f3 bao nhi\u00eau con chim? A. C\u00e0nh th\u1ee9 nh\u1ea5t c\u00f3 10 con chim, c\u00e0nh th\u1ee9 2 c\u00f3 14 con chim. B. C\u00e0nh th\u1ee9 nh\u1ea5t c\u00f3 12 con chim, c\u00e0nh th\u1ee9 2 c\u00f3 12 con chim. 75","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 42. Max c\u00f3 m\u1ed9t t\u00fai k\u1eb9o. Alison cho th\u00eam 9 c\u00e1i, sau \u0111\u00f3 Max cho em h\u1ecd 2 c\u00e1i v\u00e0 \u0103n m\u1ed9t n\u1eeda s\u1ed1 k\u1eb9o c\u00f2n l\u1ea1i. B\u00e2y gi\u1edd Max c\u00f2n l\u1ea1i 18 c\u00e1i k\u1eb9o. H\u1ecfi l\u00fac \u0111\u1ea7u Max c\u00f3 bao nhi\u00eau c\u00e1i k\u1eb9o? C\u00e2u 43. L\u00fac \u0111\u1ea7u Joe v\u00e0 Mary c\u00f3 t\u1ed5ng c\u1ed9ng 160$. Sau khi Joe \u0111\u01b0a 42$ cho Mary v\u00e0 Mary \u0111\u01b0a 48$ cho Joe th\u00ec s\u1ed1 ti\u1ec1n c\u1ee7a 2 b\u1ea1n b\u1eb1ng nhau. H\u1ecfi l\u00fac \u0111\u1ea7u m\u1ed7i b\u1ea1n c\u00f3 bao nhi\u00eau ti\u1ec1n? 76","1001 B\u00c0I TO\u00c1N T\u01af DUY \u0110\u00e1p \u00e1n ch\u1ee7 \u0111\u1ec1 6 1B, 2C, 3B, 4C, 5C, 6A, 7A, 8C, 9D, 10C, 11B, 12B, 13A, 14D, 15A, 16C, 17A, 18A, 19D, 20A, 21A, 22C, 23C, 24D, 25A, 26B, 27D, 28B, 29B, 30C, 31C, 32C, 33A, 34A, 35B, 36A, 37B, 38C, 39D, 40B, 41A, 42B, 43C. T\u1ea3i App Hoc247 Kids \u0111\u1ec3 xem video h\u01b0\u1edbng d\u1eabn gi\u1ea3i chi ti\u1ebft nh\u00e9! 77","1001 B\u00c0I TO\u00c1N T\u01af DUY Ch\u1ee7 \u0111\u1ec1 7: L\u1eadp danh s\u00e1ch. IQ v\u00e0 logic. Th\u1eeba v\u00e0 thi\u1ebfu I. Ki\u1ebfn th\u1ee9c tr\u1ecdng t\u00e2m 1. L\u1eadp danh s\u00e1ch - Khai th\u00e1c t\u1ea5t c\u1ea3 c\u00e1c d\u1eef ki\u1ec7n \u0111\u1ec1 cho \u0111\u1ec3 l\u1eadp danh s\u00e1ch ph\u00f9 h\u1ee3p. \u00e0V\u00ed d\u1ee5: Gi\u1ea3i V\u1edbi d\u1eef ki\u1ec7n \u201cT\u00edch hai s\u1ed1 l\u00e0 48\u201d, ta c\u00f3 danh s\u00e1ch c\u00e1c ph\u00e9p nh\u00e2n c\u00f3 t\u00edch l\u00e0 48 nh\u01b0 sau: 2 x 24 = 48 3 x 16 = 48 4 x 12 = 48 6 x 8 = 48 V\u1edbi d\u1eef ki\u1ec7n \u201cT\u1ed5ng hai s\u1ed1 l\u00e0 16\u201d, ta ti\u1ebfp t\u1ee5c l\u1eadp b\u1ea3ng v\u1edbi c\u00e1c s\u1ed1 h\u1ea1ng l\u00e0 c\u00e1c th\u1eeba s\u1ed1 \u1edf danh s\u00e1ch tr\u00ean v\u00e0 ta c\u00f3: V\u1eady hai s\u1ed1 \u0111\u00f3 l\u00e0 4 v\u00e0 12. 78","1001 B\u00c0I TO\u00c1N T\u01af DUY 2. IQ v\u00e0 logic \u00e0 V\u00ed d\u1ee5 1: Trong m\u1ed9t b\u1eefa ti\u1ec7c sinh nh\u1eadt, ba b\u1ea1n Mary, Kim v\u00e0 Anan \u0111\u00e3 ch\u1ecdn cho m\u00ecnh nh\u1eefng qu\u1ea3 b\u00f3ng bay v\u1edbi nh\u1eefng m\u00e0u s\u1eafc kh\u00e1c nhau. Bi\u1ebft r\u1eb1ng, Mary kh\u00f4ng c\u1ea7m qu\u1ea3 b\u00f3ng m\u00e0u xanh, Anan kh\u00f4ng c\u1ea7m qu\u1ea3 b\u00f3ng m\u00e0u xanh v\u00e0 qu\u1ea3 b\u00f3ng m\u00e0u v\u00e0ng. H\u1ecfi Kim c\u1ea7m qu\u1ea3 b\u00f3ng m\u00e0u g\u00ec? Gi\u1ea3i \u00e0V\u00ed d\u1ee5 2: Trong l\u1edbp h\u1ecdc, c\u00f3 ai \u0111\u00f3 \u0111\u00e3 x\u1ea3 r\u00e1c ra ph\u00f2ng h\u1ecdc. C\u00f4 gi\u00e1o \u0111\u00e3 r\u00fat g\u1ecdn \u0111\u01b0\u1ee3c 3 \u0111\u1ed1i t\u01b0\u1ee3ng t\u00ecnh nghi. V\u00e0 khi h\u1ecfi, ba b\u1ea1n \u0111\u00e3 tr\u1ea3 l\u1eddi: - Joshua: Em kh\u00f4ng ph\u1ea3i l\u00e0 ng\u01b0\u1eddi \u0111\u00e3 x\u1ea3 r\u00e1c \u1ea1! - Paul: C\u0169ng kh\u00f4ng ph\u1ea3i em \u1ea1! - James: Joshua \u0111\u00e3 n\u00e9m \u0111\u1ea5y \u1ea1! N\u1ebfu 1 trong s\u1ed1 h\u1ecd n\u00f3i th\u1eadt th\u00ec ai \u0111\u00e3 x\u1ea3 r\u00e1c ra ph\u00f2ng? 79","1001 B\u00c0I TO\u00c1N T\u01af DUY 3. Th\u1eeba v\u00e0 thi\u1ebfu + S\u1eed d\u1ee5ng d\u1eef ki\u1ec7n \\\"th\u1eeba\\\", \\\"thi\u1ebfu\\\" c\u1ee7a b\u00e0i to\u00e1n \u0111\u1ec3 t\u00ecm m\u1ed7i li\u00ean h\u1ec7 c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng trong b\u00e0i to\u00e1n. V\u00e0 c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 h\u00ecnh v\u1ebd \u0111\u1ec3 bi\u1ec3u di\u1ec5n v\u00e0 \u0111\u01b0a v\u1ec1 c\u00e1c d\u1ea1ng to\u00e1n quen thu\u1ed9c \u0111\u1ec3 gi\u1ea3i b\u00e0i to\u00e1n. \u00e0 V\u00ed d\u1ee5: Jack c\u00f3 m\u1ed9t gi\u1ecf t\u00e1o. N\u1ebfu m\u1ed7i ng\u00e0y b\u1ea1n \u0103n 6 qu\u1ea3 t\u00e1o th\u00ec sau v\u00e0i ng\u00e0y s\u1ebd c\u00f2n l\u1ea1i 18 qu\u1ea3. N\u1ebfu m\u1ed7i ng\u00e0y b\u1ea1n \u0103n h\u1ebft 10 qu\u1ea3 t\u00e1o th\u00ec sau c\u00f9ng s\u1ed1 ng\u00e0y \u0111\u00f3 s\u1ebd c\u1ea7n th\u00eam 2 qu\u1ea3 t\u00e1o n\u1eefa. H\u1ecfi sau bao nhi\u00eau ng\u00e0y th\u00ec Jack \u0103n h\u1ebft gi\u1ecf t\u00e1o? Gi\u1ea3i \u00e0V\u00ed d\u1ee5 2: Trong m\u1ed9t d\u1ef1 \u00e1n tr\u1ed3ng c\u00e2y, m\u1ed7i t\u00ecnh nguy\u1ec7n vi\u00ean tr\u1ed3ng s\u1ed1 c\u00e2y nh\u01b0 nhau. N\u1ebfu m\u1ed7i ng\u01b0\u1eddi tr\u1ed3ng 8 c\u00e2y, th\u00ec s\u1ebd c\u00f2n l\u1ea1i 10 c\u00e2y. N\u1ebfu m\u1ed7i ng\u01b0\u1eddi tr\u1ed3ng 11 c\u00e2y, th\u00ec m\u1ed9t ng\u01b0\u1eddi kh\u00f4ng c\u00f3 c\u00e2y \u0111\u1ec3 tr\u1ed3ng. H\u1ecfi c\u00f3 bao nhi\u00eau c\u00e2y c\u1ea7n \u0111\u01b0\u1ee3c tr\u1ed3ng? Gi\u1ea3i 80","1001 B\u00c0I TO\u00c1N T\u01af DUY B\u1ed9 c\u00e2u h\u1ecfi tr\u1eafc nghi\u1ec7m C\u00e2u 1. Nh\u00e0 b\u00e1c Lan nu\u00f4i t\u1ed5ng c\u1ed9ng c\u00f3 24 con g\u00e0 v\u00e0 th\u1ecf, v\u00e0 c\u00f3 t\u1ed5ng c\u1ed9ng 60 ch\u00e2n. H\u1ecfi c\u00f3 bao nhi\u00eau g\u00e0 v\u00e0 bao nhi\u00eau con th\u1ecf? C\u00e2u 2. Trong b\u00e3i \u0111\u1ed7 xe c\u00f3 t\u1ed5ng c\u1ed9ng 24 xe \u00f4 t\u00f4 v\u00e0 xe m\u00e1y v\u00e0 c\u00f3 t\u1ea5t c\u1ea3 80 b\u00e1nh xe. H\u1ecfi c\u00f3 bao nhi\u00eau \u00f4 t\u00f4 v\u00e0 bao nhi\u00eau xe m\u00e1y? C\u00e2u 3. Nh\u00e0 b\u00e1c Minh nu\u00f4i t\u1ea5t c\u1ea3 32 con g\u00e0 v\u00e0 ch\u00f3, v\u00e0 c\u00f3 t\u1ea5t c\u1ea3 80 c\u00e1i ch\u00e2n. H\u1ecfi c\u00f3 bao nhi\u00eau con g\u00e0 v\u00e0 bao nhi\u00eau con ch\u00f3? 81","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 4. C\u00f3 t\u1ea5t c\u1ea3 12 con chu\u1ed3n chu\u1ed3n v\u00e0 nh\u1ec7n v\u1edbi t\u1ed5ng c\u1ed9ng 92 ch\u00e2n. H\u1ecfi c\u00f3 bao nhi\u00eau chu\u1ed3n chu\u1ed3n v\u00e0 bao nhi\u00eau con nh\u1ec7n? C\u00e2u 5. Jack c\u00f3 24 \u0111\u1ed3ng xu g\u1ed3m 50 xu v\u00e0 20 xu. T\u1ed5ng gi\u00e1 tr\u1ecb c\u1ee7a c\u00e1c \u0111\u1ed3ng xu l\u00e0 1080 xu. H\u1ecfi Jack c\u00f3 bao nhi\u00eau \u0111\u1ed3ng xu m\u1ed7i lo\u1ea1i? C\u00e2u 6. \u0110\u1ec3 thu\u1eadn l\u1ee3i cho h\u1ecdc sinh trong tr\u01b0\u1eddng vui ch\u01a1i th\u1ec3 thao, nh\u00e0 tr\u01b0\u1eddng \u0111\u00e3 chi 676$ \u0111\u1ec3 mua 18 qu\u1ea3 b\u00f3ng chuy\u1ec1n v\u00e0 b\u00f3ng r\u1ed5. B\u00f3ng chuy\u1ec1n c\u00f3 gi\u00e1 42$ m\u1ed9t qu\u1ea3, qu\u1ea3 r\u1ed5 chuy\u1ec1n c\u00f3 gi\u00e1 l\u00e0 32$ m\u1ed9t qu\u1ea3. H\u1ecfi nh\u00e0 tr\u01b0\u1eddng mua bao nhi\u00eau qu\u1ea3 b\u00f3ng chuy\u1ec1n v\u00e0 b\u00f3ng r\u1ed5? 82","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 7. M\u1ed9t con nh\u1ec7n c\u00f3 8 c\u00e1i ch\u00e2n, m\u1ed9t con ki\u1ebfn c\u00f3 6 c\u00e1i ch\u00e2n, 24 con nh\u1ec7n v\u00e0 ki\u1ebfn c\u00f3 t\u1ea5t c\u1ea3 160 c\u00e1i ch\u00e2n. H\u1ecfi c\u00f3 bao nhi\u00eau con nh\u1ec7n v\u00e0 bao nhi\u00eau con ki\u1ebfn? C\u00e2u 8. Trong b\u00e0i l\u00e0m ki\u1ec3m tra c\u00f3 t\u1ea5t c\u1ea3 20 c\u00e2u, m\u1ed9t c\u00e2u \u0111\u00fang \u0111\u01b0\u1ee3c c\u1ed9ng 5 \u0111i\u1ec3m, m\u1ed9t c\u00e2u sai b\u1ecb tr\u1eeb 4 \u0111i\u1ec3m, Linh l\u00e0m \u0111\u01b0\u1ee3c 82 \u0111i\u1ec3m. H\u1ecfi Linh \u0111\u00e3 l\u00e0m \u0111\u00fang bao nhi\u00eau c\u00e2u? C\u00e2u 9. T\u00ecm gi\u00e1 tr\u1ecb c\u1ee7a h\u1ed9p qu\u00e0. A. 36 B. 32 C. 42 83","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 10. Gi\u00e1 tr\u1ecb c\u1ee7a qu\u1ea3 chu\u00f4ng l\u00e0: C\u00e2u 11. T\u00ecm gi\u00e1 tr\u1ecb c\u1ee7a c\u00e2y th\u00f4ng noel. C\u00e2u 12. H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang cho c\u00e2u h\u1ecfi sau: C\u00e2u 13. Mary l\u00e0 ch\u1ecb c\u1ee7a Jack. Anan l\u00e0 ch\u1ecb c\u1ee7a LyLy. LyLy l\u00e0 m\u1eb9 c\u1ee7a Jack. V\u1eady Anan c\u00f3 quan h\u1ec7 g\u00ec v\u1edbi Mary? A. D\u00ec B. Ch\u1ecb C. M\u1eb9 84","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 14. Trong m\u1ed9t cu\u1ed9c thi ch\u1ea1y, b\u1ed1n b\u1ea1n H\u00f9ng, Nam, Ti\u1ebfn v\u00e0 Minh \u0111\u00e3 v\u1ec1 \u0111\u00edch v\u1edbi nh\u1eefng th\u1ee9 h\u1ea1ng nh\u01b0 sau: H\u00f9ng v\u1ec1 \u0111\u00edch tr\u01b0\u1edbc Nam, Ti\u1ebfn v\u1ec1 \u0111\u00edch tr\u01b0\u1edbc Nam nh\u01b0ng v\u1ec1 sau H\u00f9ng, Minh v\u1ec1 \u0111\u00edch ch\u1eadm h\u01a1n Nam. X\u00e1c \u0111\u1ecbnh th\u1ee9 t\u1ef1 v\u1ec1 \u0111\u00edch c\u1ee7a c\u00e1c b\u1ea1n (t\u1eeb ng\u01b0\u1eddi v\u1ec1 nhanh nh\u1ea5t) C\u00e2u 15. Jack, Andy v\u00e0 Andrew m\u1ed7i ng\u01b0\u1eddi l\u00e0 ch\u1ee7 nh\u00e2n c\u1ee7a m\u1ed9t con v\u1eadt, n\u00e0o l\u00e0 ch\u00f3, m\u00e8o v\u00e0 th\u1ecf. Bi\u1ebft r\u1eb1ng, Andrew kh\u00f4ng th\u00edch nu\u00f4i ch\u00f3, Andy l\u1ea1i kh\u00f4ng th\u00edch nu\u00f4i ch\u00f3 v\u00e0 th\u1ecf. X\u00e1c \u0111\u1ecbnh con v\u1eadt nu\u00f4i c\u1ee7a Andrew. C\u00e2u 16. Andy, Jack v\u00e0 Andrew m\u1ed7i ng\u01b0\u1eddi m\u1ed9t ngh\u1ec1 nghi\u1ec7p kh\u00e1c nhau. Trong \u0111\u00f3 m\u1ed9t ng\u01b0\u1eddi l\u00e0 gi\u00e1o vi\u00ean, m\u1ed9t ng\u01b0\u1eddi l\u00e0m h\u1ecda s\u0129 v\u00e0 ng\u01b0\u1eddi con l\u1ea1i l\u00e0m k\u1ef9 s\u01b0. Andy kh\u00f4ng c\u00f9ng tu\u1ed5i v\u1edbi ng\u01b0\u1eddi l\u00e0m h\u1ecda s\u0129, Jack nhi\u1ec1u tu\u1ed5i h\u01a1n ng\u01b0\u1eddi l\u00e0m h\u1ecda s\u0129 v\u00e0 gi\u00e1o vi\u00ean. H\u1ecfi Andy l\u00e0m ngh\u1ec1 g\u00ec? 85","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 17. Kh\u00f4ng th\u1ea5y m\u1ed9t c\u00e1i b\u00e1nh d\u00e2u trong t\u1ee7 l\u1ea1nh, m\u1eb9 nghi ng\u1edd 1 trong nh\u1eefng \u0111\u1ee9a tr\u1ebb l\u1ea5y m\u1ea5t c\u00e1i b\u00e1nh. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e2u h\u1ecfi c\u1ee7a ch\u00fang khi m\u1eb9 h\u1ecfi m\u1ed7i \u0111\u1ee9a. Mary: Con kh\u00f4ng l\u1ea5y b\u00e1nh \u0111\u00e2u!_Cindy: Mary \u0111\u00e3 l\u1ea5y \u0111\u1ea5y \u1ea1!_Jack: Cindy \u0111\u00e3 \u0103n c\u00e1i b\u00e1nh \u0111\u00f3 \u0111\u1ea5y \u1ea1! N\u1ebfu m\u1ed9t trong 3 b\u1ea1n n\u00f3i d\u1ed1i, th\u00ec ai \u0111\u00e3 l\u1ea5y chi\u1ebfc b\u00e1nh. C\u00e2u 18. Ba b\u1ea1n nh\u1ecf Andy, Andrew v\u00e0 Jack ch\u01a1i \u0111\u00e1 b\u00f3ng, v\u00f4 t\u00ecnh \u0111\u00e1 tr\u00fang v\u00e0o c\u00f4 An, khi c\u00f4 An h\u1ecfi, ba b\u1ea1n \u0111\u00e3 tr\u1ea3 l\u1eddi nh\u01b0 sau: Andy: Jack \u0111\u00e3 \u0111\u00e1 \u0111\u1ea5y c\u00f4. Andrew: Kh\u00f4ng ph\u1ea3i con \u0111\u00e2u \u1ea1! Jack: Andy \u0111\u00e3 \u0111\u00e1 tr\u00fang c\u00f4 \u0111\u1ea5y \u1ea1. N\u1ebfu nh\u01b0 kh\u00f4ng c\u00f3 b\u1ea1n n\u00e0o n\u00f3i th\u1eadt, th\u00ec ai l\u00e0 ng\u01b0\u1eddi \u0111\u00e3 \u0111\u00e1 tr\u00fang c\u00f4 An? 86","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 19. Ba b\u1ea1n Lan, Linh v\u00e0 Mai d\u1eabn nhau \u0111i si\u00eau th\u1ecb, \u0111\u1ebfn c\u1eeda h\u00e0ng b\u00e1n qu\u1ea7n \u00e1o, ba b\u1ea1n m\u1ed7i ng\u01b0\u1eddi mua m\u1ed9t chi\u1ebfc v\u00e0y c\u00f3 m\u00e0u m\u00e0 m\u00ecnh th\u00edch, v\u00e0 c\u00f3 c\u00e1c m\u00e0u l\u00e0: \u0111\u1ecf, v\u00e0ng, xanh. Bi\u1ebft r\u1eb1ng, Lan kh\u00f4ng th\u00edch m\u00e0u \u0111\u1ecf, Mai l\u1ea1i kh\u00f4ng th\u00edch m\u00e0u xanh v\u00e0 m\u00e0u \u0111\u1ecf, Linh kh\u00f4ng th\u00edch v\u00e1y m\u00e0u v\u00e0ng. X\u00e1c \u0111\u1ecbnh Linh \u0111\u00e3 mua v\u00e1y m\u00e0u g\u00ec? C\u00e2u 20. C\u00f3 bao nhi\u00eau s\u1ed1 trong kho\u1ea3ng t\u1eeb 2 \u0111\u1ebfn 31 chia h\u1ebft cho 3? C\u00e2u 21. C\u00f3 bao nhi\u00eau s\u1ed1 trong kho\u1ea3ng t\u1eeb 3 \u0111\u1ebfn 94 chia h\u1ebft cho 5? 87","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 22. C\u00f3 bao nhi\u00eau c\u00e1ch \u0111\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t s\u1ed1 c\u00f3 3 ch\u1eef s\u1ed1 t\u1eeb c\u00e1c s\u1ed1 2, 4, 3, bi\u1ebft m\u1ed7i s\u1ed1 k\u1ebft h\u1ee3p ch\u1ec9 \u0111\u01b0\u1ee3c xu\u1ea5t hi\u1ec7n 1 l\u1ea7n? C\u00e2u 23. C\u00f3 bao nhi\u00eau c\u00e1ch \u0111\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t s\u1ed1 c\u00f3 3 ch\u1eef s\u1ed1 t\u1eeb c\u00e1c s\u1ed1 7, 8, 9, bi\u1ebft m\u1ed7i s\u1ed1 k\u1ebft h\u1ee3p ch\u1ec9 \u0111\u01b0\u1ee3c xu\u1ea5t hi\u1ec7n 1 l\u1ea7n? C\u00e2u 24. Jane c\u00f3 2 chi\u1ebfc v\u00e1y kh\u00e1c nhau v\u00e0 4 chi\u1ebfc \u00e1o kh\u00e1c nhau. H\u1ecfi Jane c\u00f3 th\u1ec3 c\u00f3 bao nhi\u00eau b\u1ed9 v\u00e1y \u00e1o t\u1eeb nh\u1eefng chi\u1ebfc v\u00e1y v\u00e0 \u00e1o \u0111\u00f3? 88","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 25. Trong c\u1eeda h\u00e0ng c\u00f3 2 lo\u1ea1i c\u1eb7p h\u1ecdc sinh v\u00e0 5 h\u1ed9p b\u00fat ch\u00ec kh\u00e1c nhau. H\u1ecfi George c\u00f3 bao nhi\u00eau c\u00e1ch k\u1ebft h\u1ee3p kh\u00e1c nhau n\u1ebfu b\u1ea1n \u1ea5y ch\u1ec9 c\u1ea7n m\u1ed9t chi\u1ebfc c\u1eb7p h\u1ecdc sinh v\u00e0 m\u1ed9t h\u1ed9p b\u00fat ch\u00ec? C\u00e2u 26. C\u00f4 gi\u00e1o chia m\u1ed9t t\u00fai k\u1eb9o cho h\u1ecdc sinh. N\u1ebfu m\u1ed7i h\u1ecdc sinh \u0111\u01b0\u1ee3c chia 3 vi\u00ean k\u1eb9o, c\u00f4 gi\u00e1o s\u1ebd c\u00f2n th\u1eeba 1 vi\u00ean k\u1eb9o. N\u1ebfu m\u1ed7i h\u1ecdc sinh \u0111\u01b0\u1ee3c chia 4 vi\u00ean k\u1eb9o, c\u00f4 gi\u00e1o s\u1ebd c\u00f2n thi\u1ebfu 2 vi\u00ean k\u1eb9o. H\u1ecfi c\u00f4 gi\u00e1o c\u00f3 bao nhi\u00eau vi\u00ean k\u1eb9o? C\u00e2u 27. C\u00f4 Hu\u1ec7 cho nh\u1eefng \u0111\u1ee9a tr\u1ebb h\u00e0ng x\u00f3m m\u1ed9t \u00edt b\u00e1nh quy. N\u1ebfu m\u1ed7i \u0111\u1ee9a tr\u1ebb nh\u1eadn 5 c\u00e1i b\u00e1nh quy th\u00ec s\u1ebd d\u01b0 1 c\u00e1i b\u00e1nh quy. N\u1ebfu m\u1ed7i \u0111\u1ee9a tr\u1ebb nh\u1eadn 6 c\u00e1i b\u00e1nh quy, th\u00ec c\u00f4 s\u1ebd thi\u1ebfu 5 c\u00e1i b\u00e1nh quy n\u1eefa. H\u1ecfi c\u00f3 bao nhi\u00eau c\u00e1i b\u00e1nh quy t\u1ea5t c\u1ea3? 89","1001 B\u00c0I TO\u00c1N T\u01af DUY C\u00e2u 28. M\u1eb9 cho Lan 57$ \u0111\u1ec3 mua \u0111\u1ed3 d\u00f9ng h\u1ecdc t\u1eadp. Lan \u0111\u00e3 mua t\u1ea5t c\u1ea3 16 c\u00e2y b\u00fat ch\u00ec v\u00e0 b\u00fat bi. M\u1ed9t c\u00e2y b\u00fat bi c\u00f3 gi\u00e1 l\u00e0 4$, m\u1ed9t c\u00e2y b\u00fat ch\u00ec c\u00f3 gi\u00e1 l\u00e0 3$. H\u1ecfi Lan \u0111\u00e3 mua bao nhi\u00eau c\u00e2y b\u00fat ch\u00ec v\u00e0 bao nhi\u00eau c\u00e2y b\u00fat bi? 90","1001 B\u00c0I TO\u00c1N T\u01af DUY \u0110\u00e1p \u00e1n ch\u1ee7 \u0111\u1ec1 7 1B, 2A, 3C, 4C, 5A, 6B, 7A, 8A, 9A, 10B, 11C, 12A, 13A, 14B, 15C, 16A, 17B, 18A, 19C, 20A, 21B, 22A, 23C, 24A, 25B, 26A, 27B, 28C. T\u1ea3i App Hoc247 Kids \u0111\u1ec3 xem video h\u01b0\u1edbng d\u1eabn gi\u1ea3i chi ti\u1ebft nh\u00e9! 91","1001 B\u00c0I TO\u00c1N T\u01af DUY 92"]
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