Page 229 - Math Genius C3

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Mental Maths (Page 64) Practice time 4e
1. (a) 100 (b) 600 (c) 500 (d) 700 (e) 8 (f) 660
5 4 5 (g) 100 (h) 40 (i) 6
even 2. (a) 864 (b) 445 (c) 144 (d) 504 (e) 512 (f) 492
9 16 14 29 13 21 1 3. (a) 500 (b) 160 (c) 360 (d) 1200 (e) 1240 (f) 800
odd odd 4. (a) 14000 (b) 8000 (c) 8100 (d) 3800 (e) 9300 (f) 1700
6 6 4 Practice time 4F
1. (a) 1 (b) 28 (c) 6 (d) 39 (e) 0 (f) 0
14 21 11 13 10 25 19 2. (a) 112, 112 (b) 371, 371 (c) 672, 672 (d) 280, 280
even 3. (a) 1200, 1320 (b) 300, 364 (c) 1800, 2142 (d) 1200, 1452
18 14 8 (e) 1200, 1276 (f) 800, 1008 (g) 1400, 1387 (h) 1000, 855
even Practice time 4G
Chapter assessment 1. `1150 2. 3650 3. 4416 4. 4860 5. 3216 6. `5950

1. (a) (iv) (b) (ii) (c) (iv) (d) (i) Mental Maths (Page 81)
2. (a) 0 (b) 6782 (c) 168 (d) 0
(e) 6749 (f) 3790 1. 2.
3. (a) < (b) > (c) = (d) > 3 × 3 = 9 8 × 9 = 72
4. (a) 4705 (b) 8880 (c) 9856 × × ×
5. 3996 bicycles 6. 1629 marbles 7. 9898 × ×
8. 5286 people 9. `4000 10. 7492 100 15 10 10 = 2 × 5
Challenge Question (Page 66) = = = = =
1. H t O 2. + – = 20 300 45 × 90 = 4050 80 360
5 1 5
– 3 5 7 Chapter assessment
1. (a) (i) (b) (ii)
1 5 8 2. (a) 9 (b) 0 (c) 0 (d) 0 (e) 5
(f) 1 (g) 7 (h) 4 (i) 7
Chapter 4. Multiplication 4. (a) 72 (b) 1541 (c) 2628 (d) 3478 (e) 7902
5. (a) 8245 people (b) `250 (c) 4584 (d) 252
Let's ReCaLL
Challenge Question (Page 83)
1. 3 5 5 3
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1. × 6 2. × 6
4 × 3 = 12 4 times 3 is 12 9 27 45 54 9 45 54 27
2. (a) 5 × 22 = 110 (b) 5 × 31 = 155
3. (a) 16 (b) 156 (c) 150 (d) 276 8 24 40 48 4 20 24 12
Fast Check (Page 68) 7 21 35 42 2 10 12 6
1. Multiplicand 2. Multiplier 3. Product
Practice time 4a Chapter 5. Division
Let's ReCaLL
1. Multiplicand Multiplier Product
2. (a) 10 ÷ 5 = 2 (b) 18 ÷ 3 = 6 (c) 20 ÷ 4 = 5
(a) 3 2 6 3. (a) 5 (b) 7
(b) 4 4 16 Practice time 5a
(c) 10 5 50 1. (a) 12 ÷ 2 = 6 (b) 18 ÷ 6 = 3
2. (a) 15 ÷ 3 = 5 (b) 20 ÷ 5 = 4 (c) 36 ÷ 6 = 6
2. (a) 12 (b) 27 (c) 10 (d) 2 (e) 10 3. (a) 9 (b) 9 (c) 7 (d) 5
4. (a) 8 (b) 5 (c) 4 (d) 5
× 4 × 7 × 9
(e) 6 (f) 9 (g) 3 (h) 5
40 14 90 Fast Check (Page 89)
One (49 ÷ 7 = 7)
Practice time 4B think tank (Page 89)
1. 68 2. 88 3. 90 4. 466
5. 369 6. 453 7. 966 8. 848 Dividend Divisor Quotient Division Fact
Practice time 4C 1. 32 4 8 32 ÷ 4 = 8
1. (a) 792 (b) 504 (c) 5552 (d) 2136 2. 63 7 9 63 ÷ 7 = 9
2. (a) 664 (b) 462 (c) 610 (d) 684 (e) 1630 (f) 3822
Practice time 4D 3. 30 3 10 30 ÷ 3 = 10
1. (a) 714 (b) 1764 (c) 1288 (d) 4672 (e) 2448 (f) 7546 4. 56 4 14 56 ÷ 4 = 14
(g) 9288 (h) 7371 5. 60 5 12 60 ÷ 5 = 12
2. (a) 308 (b) 496 (c) 7308 (d) 8030 Practice time 5B
3. (a) 231 (b) 336 (c) 462 1. (a) 4 × 8 = 32 (b) 9 × 6 = 54 (c) 7 × 8 = 56
think tank (Page 78) 32 ÷ 8 = 4 54 ÷ 6 = 9 56 ÷ 8 = 7
10 and 1000 32 ÷ 4 = 8 54 ÷ 9 = 6 56 ÷ 7 = 8

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