My NUMBER OPERATIONS Book 2 Name: ___________________________________ Section: ________________ Roll No.: _________ School: __________________________________Number Operations g2.indb 1 07-11-2018 16:53:49
Contents1 Fact Family: 1–10....................................................... 12 Breaking Down Numbers.......................................... 213 Skip Counting.............................................................414 Repeated Addition................................................... 495 Multiplication Tables................................................. 53Number Operations g2.indb 2 07-11-2018 16:53:50
Fact family: 1–10 What is a fact family? Fact family of 4A. Putting together + is Put together 3 and 1 = 4 in total 3+ 1 is 4 =B. Take away 3 are left 3 From 4, take away 1 4– 1 is From 4, take away 3 = 1 is left 4– 3 1 4, 3 and 1 make a fact family.Number Operations g2.indb 1 1 07-11-2018 16:53:53
Fact families of 1, 2Let us learnComplete the fact family for each setof numbers given below.Fact family: 1, 1, 0 Fact family: 2, 2, 0 1 2 10 20 1 0=1– 1 0+ =2 2 +1=1 2 0= –2 3 1= +0 3 –2=0 4 1=0+ 4 +0=2 5 0+1= 5 2= –0 6 1= +1 6 2=2– 7 +0=1 7 =2–2 8 =1–1 8 =0+2 9 =1+0 9 +2=2 10 0 = – 1 10 2 = + 2 11 1 = 1 + 11 2 – 2 = 12 1 + = 1 12 2 – = 2 13 – 0 = 1 13 2 = 2 + 2 07-11-2018 16:53:55Number Operations g2.indb 2
Fact families of 2, 3 Fact family: 3, 3, 0 3 Fact family: 2, 1, 1 2 30 11 1 –3=0 1 1+1= 2 0= –3 2 2=1+ 3 3+ =3 3 =1+1 4 3–0= 4 2– =1 5 +0=3 5 2= +1 6 0+ =3 6 2–1= 7 3– =0 7 =2–1 8 3=3– 8 1=2– 9 3=0+ 9 +1=2 10 3 = – 0 10 – 1 = 1 11 3 – 3 = 11 1 = – 1 12 3 – = 3 12 1 + = 2 13 3 + 0 = 14 0 = 3 –Number Operations g2.indb 3 15 = 3 – 0 16 0 + 3 = 17 3 = + 0 3 Fact Family: 1–10 07-11-2018 16:53:59
Fact family: 3, 2, 1 Fact families of 3, 4 3 Fact family: 4, 4, 0 21 4 1 3–2= 40 2 3= +2 3 –1=2 1 =4+0 4 2= –1 2 4+ =4 5 =3–1 3 4= –0 6 3= +1 4 4=0+ 7 1=3– 5 4–0= 8 –2=1 6 4= +0 9 3– =2 7 =4–4 10 3 = 2 + 8 +0=4 11 + 1 = 3 9 0= –4 12 = 3 – 2 10 0 = 4 – 13 2 = 3 – 11 4 = 4 – 14 = 1 + 2 12 4 = + 4 15 1 = – 2 13 – 0 = 4 16 + 2 = 3 14 + 4 = 4 17 1 + = 3 15 4 – = 0 16 = 4 – 0 4 17 4 – = 4Number Operations g2.indb 4 07-11-2018 16:54:01
Fact families of 4 Fact family: 4, 2, 2 Fact family: 4, 3, 1 4 4 22 31 1 =2+2 2 4=2+ 1 4– =3 3 2= –2 2 1+3= 4 2+2= 3 –1=3 5 =4–2 4 4= +1 6 2=4– 5 3+1= 7 4= +2 6 4–3= 8 2+ =4 7 +3=4 9 4– =2 8 =1+3 10 4 – 2 = 9 3=4– 11 + 2 = 4 10 = 4 – 3 12 – 2 = 2 11 3 = – 1 12 4 – = 1 5 13 = 3 + 1 14 3 + = 4 Fact Family: 1–10 15 + 1 = 4 16 4 = 3 + 07-11-2018 16:54:02 17 4 – 1 =Number Operations g2.indb 5
Fact family: 5, 5, 0 Fact families of 5 5 Fact family: 5, 4, 1 50 5 1 +0=5 41 2 0+5= 3 5=5+ 1 5=1+ 4 5=0+ 2 1+ =5 5 =0+5 3 5= +4 6 5=5– 4 4=5– 7 +5=5 5 +1=5 8 5– =0 6 4= –1 9 0=5– 7 4+1= 10 5 – 0 = 8 +4=5 11 0 + = 5 9 5–1= 12 5 + = 5 10 = 5 – 1 13 5 – 5 = 11 5 – = 4 14 5 = + 5 12 5 – 4 = 15 = 5 – 0 13 = 5 – 4 16 – 0 = 5 14 – 1 = 4 17 5 – = 5 15 5 = + 1 16 4 + = 5 6 17 1 = 5 –Number Operations g2.indb 6 07-11-2018 16:54:04
Fact family of 5 Complete Time: the following 2 minutes Fact family: 5, 3, 2 facts. 5 1 –1=0 2 2=0+ 32 3 =1–0 4 3= +0 1 5– =3 5 3=3+ 2 5– =2 6 5– =5 3 2=5– 7 2=3– 4 –2=3 8 2–2= 5 2= –3 9 1=2– 6 5=3+ 10 5 = + 0 7 3+2= 11 2 = + 2 8 3= –2 12 + 2 = 3 9 3+ =5 13 = 2 – 0 10 = 5 – 3 14 + 1 = 3 11 2 + = 5 15 1 = 1 + 12 5 – 3 = 16 + 0 = 1 13 5 = + 2 17 + 0 = 4 14 5 = 2 + 18 2 + 2 = 15 5 – 2 = 16 + 3 = 5 7 17 = 3 + 2 Fact Family: 1–10Number Operations g2.indb 7 07-11-2018 16:54:06
Fact family: 6, 6, 0 Fact families of 6 6 Fact family: 6, 5, 1 60 6 1 +6=6 51 2 6– =6 3 6=6+ 1 6– =1 4 6 – 6= 2 =5+1 5 =0 +6 3 6= +5 6 =6–6 4 =1+5 7 6= +0 5 1+5= 8 6+ =6 6 1+ =6 9 =6 – 0 7 5= –1 10 0 = 6 – 8 –5=1 11 – 0 = 6 9 =6–5 12 = 6 + 0 10 1 = 6 – 13 6 – = 0 11 1 = – 5 14 6 = 6 – 12 5 + = 6 15 + 0 = 6 13 6 = + 1 16 6 = – 0 14 5 = 6 – 17 6 = + 6 15 = 6 – 1 16 6 – 1 = 8 17 6 = 1 +Number Operations g2.indb 8 07-11-2018 16:54:08
Fact families of 6 Fact family: 6, 3, 3 Fact family: 6, 4, 2 6 6 33 42 1 =6–3 2 3=6– 1 4= –2 3 –3=3 2 2=6– 4 3= –3 3 6=4+ 5 6=3+ 4 6=2+ 6 =3+3 5 =2+4 7 3+3= 6 4=6– 8 6= +3 7 –4=2 9 3+ =6 8 6– =4 10 6 – = 3 9 6–2= 11 6 – 3 = 10 6 = + 2 12 + 3 = 6 11 = 6 – 2 12 = 6 – 4 9 13 2 + 4 = 14 4 + 2 = Fact Family: 1–10 15 – 2 = 4 16 4 + = 6 07-11-2018 16:54:10 17 2 + = 6Number Operations g2.indb 9
Fact family: 7, 7, 0 Fact families of 7 7 Fact family: 7, 6, 1 70 7 1 7–0= 61 2 +7=7 3 7–7= 1 =7–1 4 0= –7 2 +1=7 5 =7+0 3 6+ =7 6 7= –0 4 =7–6 7 =7–0 5 7– =1 8 7=7– 6 =6+1 9 7=7+ 7 1=7– 10 – 0 = 7 8 –1=6 11 = 0 + 7 9 1+ =7 12 7 + = 7 10 7 = 6 + 13 7 = 0 + 11 6 + 1 = 14 – 7 = 0 12 7 – 6 = 15 0 + = 7 13 1 = – 6 16 + 0 = 7 14 = 1 + 6 17 7 = + 7 15 7 = + 1 16 – 6 = 1 10 17 6 = 7 –Number Operations g2.indb 10 07-11-2018 16:54:12
Fact families of 7 Fact family: 7, 4, 3 7 Fact family: 7, 5, 2 43 7 1 7–3= 52 2 4= –3 3 –4=3 1 2= –5 4 4=7– 2 –2=5 5 4+ =7 3 5=7– 6 =4+3 4 7– =5 7 3+4= 5 7= +2 8 7= +4 6 7=2+ 9 7= +3 7 2+ =7 10 3 + = 7 8 –5=2 11 = 7 – 3 9 2=7– 12 + 4 = 7 10 2 + 5 = 13 7 = 3 + 11 = 2 + 5 14 7 – = 4 12 = 5 + 2 15 – 3 = 4 13 7 = + 5 16 4 + 3 = 14 = 7 – 2 17 = 7 – 4 15 7 = 5 + 16 5 + = 7 11 17 + 5 = 7 Fact Family: 1–10Number Operations g2.indb 11 07-11-2018 16:54:14
Fact family: 8, 8, 0 Fact families of 8 8 Fact family: 8, 7, 1 80 8 1 8=0+ 71 2 8–8= 3 +0=8 1 8=7+ 4 =8–8 2 8– =1 5 0=8– 3 =1+7 6 =8+0 4 =8–1 7 8– =8 5 7+1= 8 –8=0 6 8–1= 9 8–0= 7 =7+1 10 0 + = 8 8 1+7= 11 0 = – 8 9 7=8– 12 = 8 – 0 10 8 = + 7 13 8 – = 0 11 8 – 7 = 14 8 = + 0 12 + 1 = 8 15 = 0 + 8 13 – 7 = 1 16 – 0 = 8 14 1 = – 7 17 8 = 8 – 15 7 + = 8 16 8 = 1 + 12 17 1 = 8 –Number Operations g2.indb 12 07-11-2018 16:54:15
Fact families of 8 Fact family: 8, 5, 3 8 Fact family: 8, 6, 2 53 8 1 +5=8 62 2 +3=8 3 8– =3 1 8=2+ 4 =8–3 2 8= +6 5 –5=3 3 6+ =8 6 =3+5 4 +6=8 7 8–3= 5 –2=6 8 8= +3 6 2+ =8 9 8=3+ 7 6=8– 10 3 + = 8 8 2=8– 11 3 = – 5 9 8–2= 12 8 – = 5 10 = 8 – 6 13 5 = 8 – 11 = 2 + 6 14 3 = 8 – 12 8 – = 6 15 = 5 + 3 13 8 = + 2 16 5 + = 8 14 2 = – 6 17 8 – 5 = 15 + 2 = 8 16 – 6 = 2 13 17 = 8 – 2 Fact Family: 1–10Number Operations g2.indb 13 07-11-2018 16:54:18
Fact family: 8, 4, 4 Fact families of 8, 9 8 Fact family: 9, 9, 0 44 1 4= –4 9 2 8=4+ 3 4+4= 90 4 8– =4 5 =8–4 1 9+0= 6 8–4= 2 =9–0 7 +4=8 3 =9+0 8 8= +4 4 0= –9 9 =4+4 5 9–0= 10 – 4 = 4 6 9= +9 11 4 + = 8 7 9=9– 12 4 = 8 – 8 9= –0 9 9= +0 14 10 – 9 = 0 11 = 0 + 9Number Operations g2.indb 14 12 0 = 9 – 13 9 = 9 + 14 9 + = 9 15 = 9 – 9 16 9 – = 0 17 – 0 = 9 07-11-2018 16:54:19
Fact families of 9 Fact family: 9, 7, 2 9 Fact family: 9, 8, 1 72 9 1 =9–7 81 2 =7+2 3 –2=7 1 9– =1 4 9– =2 2 =9–8 5 7+2= 3 9=1+ 6 2=9– 4 8= –1 7 =2+7 5 9= +8 8 +7=9 6 9–1= 9 2+ =9 7 =8+1 10 – 7 = 2 8 =9–1 11 9 – = 7 9 1+ =9 12 = 9 – 2 10 1 = 9 – 13 7 + = 9 11 8 = 9 – 14 2 = – 7 12 1 = – 8 15 9 = 7 + 13 9 = + 1 16 9 – 2 = 14 – 8 = 1 17 7 = 9 – 15 8 + = 9 16 1 + 8 = 15 17 = 1 + 8 Fact Family: 1–10Number Operations g2.indb 15 07-11-2018 16:54:21
Fact family: 9, 6, 3 Fact families of 9 9 Fact family: 9, 5, 4 63 9 1 6= –3 54 2 9–3= 3 =9–3 1 5= –4 4 6+3= 2 4+5= 5 6=9– 3 9– =5 6 =3+6 4 9=4+ 7 3+6= 5 5=9– 8 =6+3 6 9= +5 9 9=3+ 7 9–5= 10 3 + = 9 8 4+ =9 11 3 = 9 – 9 4=9– 12 3 = – 6 10 = 5 + 4 13 + 6 = 9 11 4 = – 5 14 9 – = 6 12 – 5 = 4 15 + 3 = 9 13 = 9 – 4 16 9 – = 3 14 5 + 4 = 17 – 3 = 6 15 9 – 4 = 16 5 + = 9 16 17 + 5 = 9Number Operations g2.indb 16 07-11-2018 16:54:23
Fact families of 10 Fact family: 10, 9, 1 10 Fact family: 10, 10, 0 91 10 1 9+1= 10 0 2 –9=1 3 10 – = 1 1 10 + 0 = 4 1 = 10 – 2 10 = – 0 5 9 + = 10 3 0 = – 10 6 = 10 – 1 4 10 = + 10 7 –1=9 5 + 0 = 10 8 =9+1 6 = 10 – 0 9 10 = 1 + 7 10 = 10 + 10 9 = – 1 8 10 – = 10 11 9 = 10 – 9 10 + = 10 12 10 – = 9 10 = 0 + 10 13 + 1 = 10 11 10 – = 0 14 10 – 9 = 12 – 10 = 0 15 10 = 9 + 13 0 + 10 = 16 = 10 – 9 14 10 = + 0 17 = 1 + 9 15 10 – 0 = 16 = 10 + 0 17 17 10 = 10 – Fact Family: 1–10Number Operations g2.indb 17 07-11-2018 16:54:24
Fact family: 10, 8, 2 Fact families of 10 10 Fact family: 10, 7, 3 82 10 1 = 10 – 2 73 2 10 = 8 + 3 =8+2 1 + 7 = 10 4 10 – = 8 2 =7+3 5 =2+8 3 10 = + 3 6 + 8 = 10 4 10 = 7 + 7 10 – 8 = 5 7= –3 8 2+8= 6 7 = 10 – 9 2 + = 10 7 10 – = 7 10 10 = + 2 8 = 10 – 7 11 – 8 = 2 9 7+3= 12 10 = 2 + 10 10 – 7 = 13 8 = 10 – 11 7 + = 10 14 8 = – 2 12 3 = – 7 15 = 10 – 8 13 3 + 7 = 16 10 – = 2 14 – 7 = 3 17 2 = – 8 15 = 10 – 3 16 10 = + 7 18 17 3 = –Number Operations g2.indb 18 07-11-2018 16:54:26
Fact families of 10 Fact family: 10, 5, 5 Fact family: 10, 6, 4 10 10 55 64 1 5= –5 2 10 = + 5 1 –6=4 3 5 = 10 – 2 =4+6 4 –5=5 3 + 4 = 10 5 5+5= 4 = 10 – 4 6 + 5 = 10 5 4+6= 7 10 – = 5 6 10 = + 6 8 10 – 5 = 7 10 = + 4 9 =5+5 8 –4=6 10 = 10 – 5 9 10 – = 4 11 10 = 5 + 10 10 – 6 = 12 5 + = 10 11 = 6 + 4 12 4 = 10 – 19 13 6 + 4 = 14 = 10 – 6 Fact Family: 1–10 15 10 = 4 + 16 + 6 = 10 07-11-2018 16:54:28 17 10 – = 6Number Operations g2.indb 19
Complete the following facts. Time: 5 minutes 1 8 + = 10 21 10 – 9 = 2 6= +6 22 = 2 + 0 3 +6=6 23 = 0 + 1 4 9= +6 24 = 6 – 4 5 6= +0 25 7 = – 3 6 7= +1 26 1 + = 1 7 =6–6 27 1 – = 1 8 2–1= 28 3 – 2 = 9 2 + = 10 29 9 – 3 = 10 – 3 = 1 30 7 = 2 + 11 = 7 + 3 31 6 = 3 + 12 8 = + 0 32 9 + 0 = 13 = 6 – 3 33 6 = 4 + 14 – 1 = 9 34 3 + = 5 15 8 – = 0 35 5 + 4 = 16 = 6 – 5 36 1 + 6 = 17 4 = 6 – 37 10 = 3 + 18 10 – 2 = 38 5 = – 5 19 4 + 6 = 39 5 + = 10 20 5 = + 1 40 + 3 = 1020Number Operations g2.indb 20 07-11-2018 16:54:30
BREAKING DOWN NUMBERS Let us revise Expand the numbers represented below. = tens = onesExample: = 3 tens + 2 ones = 321 = ____ tens + ____ ones = ____2 = ____ tens + ____ ones = ____ 21Number Operations g2.indb 21 07-11-2018 16:54:33
3 = ____ tens + ____ ones = ____4 = ____ tens + ____ ones =____5 = ____ tens + ____ ones =____6 = ____ tens + ____ ones = ____7 = ____ tens + ____ ones = ____ 22 07-11-2018 16:54:36Number Operations g2.indb 22
8 = ____ tens + ____ ones = ____Expand the following = tens = onesnumbers.1 50 = ____ + ____2 48 = ____ + ____3 80 = ____ + ____4 54 = ____ + ____5 29 = ____ ones + ____ tens6 61 = ____ tens + ____ ones7 76 = ____ ones + ____ tens8 93 = ____ tens + ____ ones9 30 = ____ ones + ____ tens10 64 = ____ tens + ____ ones 23 Breaking Down NumbersNumber Operations g2.indb 23 07-11-2018 16:54:38
Add the numbers shown below. = tens = ones 1 = 10 ten onesExample: + 1 = (3 + 1) tens + (2 + 2) ones = 44 + = ________ tens + ________ ones = ________2 + = ________ tens + ________ ones = ________24Number Operations g2.indb 24 07-11-2018 16:54:40
3 + = ________ tens + ________ ones = ________4 + = ________ tens + ________ ones = ________5 + = ________ tens + ________ ones = ________ 25 Breaking Down NumbersNumber Operations g2.indb 25 07-11-2018 16:54:42
Add the following numbers mentally.1 84 + 10 = 6 49 + 20 =2 55 + 30 = 7 35 + 20 =3 30 + 60 = 8 22 + 60 =4 34 + 40 = 9 27 + 70 =5 55 + 10 = 10 31 + 50 =Add the following numbers.1 73 2 26 3 72 +23 +60 +154 21 5 78 6 22 +54 +10 +487 41 8 78 9 51 +39 +21 +29 10 6 6 11 4 0 12 6 8 +30 +20 +11 26 07-11-2018 16:54:43Number Operations g2.indb 26
Subtract the numbers = tens = onesshown below. Example: – = (3 – 1) tens + (2 – 1) ones = 211 – = ________ tens + ________ ones = ________2 – = ________ tens + ________ ones = ________ 27 Breaking Down NumbersNumber Operations g2.indb 27 07-11-2018 16:54:44
3 – = ________ tens + ________ ones = ________4 – = ________ tens + ________ ones = ________5 – 07-11-2018 16:54:46 = ________ tens + ________ ones = ________ 28Number Operations g2.indb 28
Subtract the following numbers mentally.1 47 – 20 = 6 88 – 70 =2 62 – 10 = 7 60 – 30 =3 87 – 40 = 8 96 – 80 =4 84 – 50 = 9 85 – 60 =5 39 – 10 = 10 57 – 40 =Subtract the following numbers.1 39 2 97 3 78 –24 –41 –254 84 5 55 6 80 –60 –25 –307 65 8 59 9 96 –33 –12 –75 10 6 3 11 8 5 12 9 1 –21 –13 –10Number Operations g2.indb 29 29 Breaking Down Numbers 07-11-2018 16:54:47
Let us learn Expand the numbers represented below. = hundreds = tens = onesExample: = 4 hundreds + 2 tens + 3 ones = 423 = 2 hundreds + 3 tens + 5 ones = 2351 = ___ hundreds + ___ tens + ___ ones = ______2 = ___ hundreds + ___ tens + ___ ones = ______30Number Operations g2.indb 30 07-11-2018 16:54:50
3 = ___ hundreds + ___ tens + ___ ones = ______4 = ___ hundreds + ___ tens + ___ ones = ______5 = ___ hundreds + ___ tens + ___ ones = ______6 = ___ hundreds + ___ tens + ___ ones = ______7 = ___ hundreds + ___ tens + ___ ones = ______ 31 Breaking Down NumbersNumber Operations g2.indb 31 07-11-2018 16:54:53
Expand the = hundreds = tens = ones following. 1 +2 +0 240 = 4 2 + ___ + ___ 136 = ___ 3 + ___ + ___ 760 = ___ 4 + ___ + ___ 549 = ___ 5 + ___ + ___ 955 = ___ 6 + ___ + ___ 687 = ___ 7 620 = ___ hundreds + ___ ones + ___ tens 8 644 = ___ hundreds + ___ tens + ___ ones 9 798 = ___ ones + ___ tens + ___ hundreds 10 679 = ___ tens + ___ hundreds + ___ ones 11 992 = ___ hundreds + ___ tens + ___ ones 12 466 = ___ ones + ___ hundreds + ___ tens 13 806 = ___ hundreds + ___ tens + ___ ones 14 376 = ___ tens + ___ ones + ___ hundreds 15 288 = ___ tens + ___ ones + ___ hundreds32Number Operations g2.indb 32 07-11-2018 16:54:54
Add the numbers = hundreds = tens = onesshown below. = 10 ones = 10 tens 1 1 ten hundredExample: + 1ten = (1+1) hundreds + (1+0) tens + (7+4) ones=10 = 2 hundreds + (1+1) tens + 1 onesones = 2211 + = ____ hundreds + ____ tens + ____ ones = ______ 33 Breaking Down NumbersNumber Operations g2.indb 33 07-11-2018 16:54:57
2+ = ____ hundreds + ____ tens + ____ ones = ______3 + = ____ hundreds + ____ tens + ____ ones = ______4 + = ____ hundreds + ____ tens + ____ ones = ______5 + = ____ hundreds + ____ tens + ____ ones = ______34Number Operations g2.indb 34 07-11-2018 16:54:59
Add the following numbers mentally.1 261 + 40 = 13 281 + 100 =2 488 + 70 = 14 630 + 300 =3 493 + 90 = 15 252 + 400 =4 112 + 20 = 16 315 + 200 =5 321 + 60 = 17 543 + 300 =6 388 + 30 = 18 106 + 800 =7 630 + 30 = 19 387 + 500 =8 333 + 40 = 20 653 + 100 =9 130 + 80 = 21 246 + 700 =10 147 + 10 = 22 648 + 200 =11 102 + 20 = 23 317 + 600 =12 727 + 10 = 24 421 + 300 =Add the following numbers.1 378 2 299 +610 +2003 751 4 921 +210 +289 35 Breaking Down NumbersNumber Operations g2.indb 35 07-11-2018 16:55:00
5 480 6 154 +402 +603 7 911 8 872 +119 +116 9 742 10 8 0 0 +153 +147 11 9 4 6 12 8 1 4 +140 +112 13 3 3 6 14 5 3 1 +602 +379 15 4 5 4 16 5 6 5 +364 +977 36 07-11-2018 16:55:01Number Operations g2.indb 36
Subtract the = hundreds = tens = onesnumbers shownbelow. = 10 ones = 10 tens 1 1 ten hundredExample: – 1ten = (1–1) hundreds + (2–0) tens + (3–4) ones=10 = 0 hundreds + (1–0) tens + (13–4) onesones = 191 – = ____ hundreds + ____ tens + ____ ones = ______ 37 Breaking Down NumbersNumber Operations g2.indb 37 07-11-2018 16:55:03
2– = ____ hundreds + ____ tens + ____ ones = ____3 – = ____ hundreds + ____ tens + ____ ones = ____4 – = ____ hundreds + ____ tens + ____ ones = ____5 – = ____ hundreds + ____ tens + ____ ones = ____38Number Operations g2.indb 38 07-11-2018 16:55:06
Subtract the following numbers mentally.1 394 – 60 = 13 572 – 200 =2 771 – 30 = 14 378 – 100 =3 284 – 50 = 15 419 – 300 =4 462 – 20 = 16 423 – 400 =5 816 – 10 = 17 650 – 200 =6 999 – 70 = 18 950 – 700 =7 784 – 80 = 19 805 – 600 =8 359 – 30 = 20 898 – 400 =9 459 – 40 = 21 653 – 500 =10 825 – 10 = 22 239 – 100 =11 526 – 30 = 23 647 – 200 =12 483 – 80 = 24 979 – 800 =Subtract the following numbers.1 657 2 685 –334 –2823 671 4 419 –610 –111 39 Breaking Down NumbersNumber Operations g2.indb 39 07-11-2018 16:55:07
5 754 6 564 –753 –115 7 565 8 852 –305 –512 9 208 10 1 1 0 –153 –100 11 2 3 0 12 8 3 7 –110 –713 13 1 5 2 14 7 3 9 –152 –721 15 8 6 2 16 1 2 7 –102 –125 40 07-11-2018 16:55:08Number Operations g2.indb 40
Skip Counting Let us REVISE Practise skip counting by 2 and 3 Count the number of objects.1 =2 = 41Number Operations g2.indb 41 07-11-2018 16:55:11
3 = 4 =Show skip counting on the number line. 1 Skip count by 2: Start at 16 and skip count backwards 3 times. 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2142Number Operations g2.indb 42 07-11-2018 16:55:17
2 Skip count by 2: Start at 1 and skip count forwards 7 times. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 163 Skip count by 3: Start at 6 and skip count forwards 5 times 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 214 Skip count by 3: Start at 32 and skip count backwards 9 times.5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33Complete the series.1 70, ___ , ___ , ___ , ___ , 55, 52, 49, 46, 43, 402 11, 13, 15, ___ , 19, ___ , 23, ___ , ___ , 29, 313 29, ___ , 33, ___ , 37, 39, 41, ___ , ___ , 47, 494 16, ___ , ___ , ___ , ___ , 31, 34, 37, 40, 43, 465 75, 72, ___ , 66, 63, ___ , ___ , 54, ___ , 48, 456 95, ___ , ___ , ___ , ___ , 85, 83, 81, 79, 77, 757 29, 31, 33, ___ , 37, ___ , ___ , ___ , 45, 47, 498 28, 30, 32, ___ , ___ , ___ , 40, 42, 44, ___ , 48 43 Skip CountingNumber Operations g2.indb 43 07-11-2018 16:55:19
Let us learn Practise skip counting by 4 and 5 Count the number of objects.1 =2 = 07-11-2018 16:55:21 44Number Operations g2.indb 44
3 45 = Skip Counting 4 07-11-2018 16:55:26 = 5 = 6 =Number Operations g2.indb 45
Show skip counting on the number line. 1 Skip count by 5: Start at 17 and skip count forwards 5 times.15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 432 Skip count by 4: Start at 30 and skip count backwards 4 times.10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 383 Skip count by 4: Start at 35 and skip count backwards 6 times.10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 384 Skip count by 5: Start at 13 and skip count forwards 5 times. 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 4046Number Operations g2.indb 46 07-11-2018 16:55:26
5 Skip count by 4: Start at 4 and skip count forwards 6 times.1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 296 Skip count by 5: Start at 26 and skip count backwards 4 times.0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 287 Skip count by 4: Start at 3 and skip count forwards 6 times.1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 298 Skip count by 5: Start at 31 and skip count backwards 3 times.10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 47 Skip CountingNumber Operations g2.indb 47 07-11-2018 16:55:27
Complete the series. 1 70, 65, ___ , ___ , 50, 45, 40, 35, ___ , ___ , 20 2 63, 59, ___ , ___ , ___ , ___ , 39, 35, 31, 27, 23 3 64, 60, 56, 52, ___ , ___ , ___ , ___ , 32, 28, 24 4 15, 19, ___ , ___ , 31, 35, ___ , ___ , 47, 51, 55 5 78, 73, 68, ___ , 58, ___ , 48, 43, ___ , ___ , 28 6 120, 116, ___ , 108, 104, ___ , 96, 92, 88, ___ , 80 7 22, 26, 30, 34, 38, ___ , ___ , ___ , 54, 58, 62 8 24, ___ , 32, ___ , 40, 44, ___ , 52, ___ , 60, 64 9 29, 33, ___ , ___ , 45, 49, 53, 57, ___ , 65, 69 10 103, ___ , ___ , ___ , 87, 83, 79, ___ , 71, 67, 63 11 110, 105, 100, ___ , 90, ___ , 80, ___ , ___ , 65, 60 12 29, ___ , 37, ___ , 45, ___ , ___ , 57, 61, 65, 69 13 117, ___ , 109, ___ , 101, 97, ___ , ___ , 85, 81, 77 14 7, 12, 17, 22, ___ , ___ , ___ , ___ , 47, 52, 57 15 14, 19, ___ , ___ , ___ , 39, ___ , 49, 54, 59, 64 16 105, ___ , 97, 93, ___ , 85, 81, ___ , 73, ___ , 65 17 30, ___ , 38, ___ , ___ , ___ , 54, 58, 62, 66, 70 18 9, ___ , 17, ___ , 25, 29, ___ , ___ , 41, 45, 49 19 9, 14, 19, 24, 29, 34, 39, ___ , 49, 54, 59 20 12, 16, 20, 24, 28, ___ , ___ , ___ , 44, ___ , 52 21 78, 73, ___ , 63, ___ , ___ , ___ , 43, 38, 33, 28 22 7, ___ , ___ , 19, ___ , 27, ___ , 35, 39, 43, 4748Number Operations g2.indb 48 07-11-2018 16:55:28
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