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HOTS c. Factors of 10 = 1, 2, 5, 10 Common Factors
1. 3 2. 4 3. 4 4. 4 Factors of 20 = 1, 2, 4, 5, 10, 20 1 2
4
5
Puzzle Common factors = 1, 2, 5, 10 10 20
70 students Factors Factors
Chapter 5: Multiples and Factors of 10 of 20
Warm Up d. Factors of 18 = 1, 2, 3, 6, 9, 18 Common Factors
1. Number of rows 1 2 3 4 5 6 7 8 9 10 Factors of 32 = 1, 2, 4, 8, 16, 32
Number of camels 3 6 9 12 15 18 21 24 27 30 Common factors = 1, 2 3 6 1 4, 8
2. b. There are 2 groups of 6 dancers each. So, 2 × 6 = 12 9 18 2 16 32
c. There are 3 groups of 4 dancers each. So, 3 × 4 = 12 Factors Factors
Exercise 5A of 18 of 32
1. 3, 6, 9, 12 2. a. 1, 3 b. 1, 2, 3, 6, 9, 18 c. 1 d. 1, 5
2. a. 7, 14, 21, 28, 35, 42 b. 9, 18, 27, 36, 45, 54 e. 1, 7 f. 1, 2, 4, 8 g. 1, 2, 4 h. 1, 2
c. 11, 22, 33, 44, 55, 66 d. 15, 30, 45, 60, 75, 90 Learning Logs
e. 18, 36, 54, 72, 90, 108 f. 25, 50, 75, 100, 125, 150
3. a. 10, 20, 30, 40, 50 b. 14, 28, 42, 56, 70 1. a. 3, 11 b. 6 c. factors d. 30
c. 22, 44, 66, 88, 110 d. 26, 52, 78, 104, 130 2. 24, 48, 72
e. 30, 60, 90, 120, 150 f. 50, 100, 150, 200, 250 3. a. 1, 3, 5, 15 b. 1, 3, 7, 21 c. 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
4. a. 3, 9, 15, 21, 27 b. 17, 51, 85, 119, 153 d. 1, 2, 4, 7, 8, 14, 28, 56
c. 19, 57, 95, 133, 171 d. 21, 63, 105, 147, 189 4. a. 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62,
e. 27, 81, 135, 189, 243 f. 35, 105, 175, 245, 315 64
5. 72, 96, 120, 144, 280 b. 30, 35, 40, 45, 50, 55, 60 c. 30, 40, 50, 60
6. a. 40 b. 72 c. 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132 d. 30, 40, 50, 60 e. 30, 40, 50, 60
d. 21, 24, 27, 30, 33, 36, 39, 42, 45, 48
e. 54, 63, 72, 81, 90, 99 f. 72 f. 30, 36, 42, 48, 54, 60
7. a. F b. T c. T d. F e. T f. F 5. a. Yes b. Yes
8. a. 8; 48, 56, 64 b. 9; 72, 81, 90 c. 14; 112, 126, 140 6. 2905 330 3240
d. 15; 75, 90, 105 405 3438 1738
Exercise 5B 635 1308 1965
1. a. 6, 12, 18 b. 10, 20 c. 6, 12, 18 1430 3225 882
2. a. 20, 40, 60, 80 b. 10, 20, 30, 40 c. 14, 28, 42, 56 1116 565 1914 480 3894 3080
d. 20, 40, 60, 80 e. 24, 48, 72, 96 2270 1940 295
3. a. 18 , 36, 54, 72, ... b. 30 , 60, 90, 120, ... c. 24 , 48, 72, 96, ...
d. 30 , 60, 90, 120, ... e. 60 , 120, 180, ...
a. b. c.
Exercise 5C Mental Maths
1. a. 1, 2, 3, 5, 6, 10, 15 b. 1, 2, 4, 5, 10 c. 1, 2, 4, 8, 16
1. c 2. a 3. b 4. c 5. a
2. 1 × 24, 2 × 12, 4 × 6, 3 × 8 6. c
Factors of 24 = 1, 2, 3, 4, 6, 8, 12, 24 HOTS
3. a. 1, 3, 5, 9, 15, 45 b. 1, 2, 4, 7, 8, 14, 28, 56
1. a. 12, 16, 20, 24, 28 b. 12, 24 c. 12
c. 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 Puzzle
d. 1, 3, 13, 39 e. 1, 13
4. a. Yes b. No c. Yes d. No
5. a. 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 b. 6, 8, 10, 14, 15, 21, 22, 26, 27
c. 4, 9, 25
6. a. True b. False c. True d. False e. False f. True
Exercise 5D
1. a. Factors of 6 = 1, 2, 3, 6 Common Factors
Factors of 10 = 1, 2, 5, 10
Common factors = 1, 2 3 1 5
6 2 10
Factors Factors
of 6 of 10 Chapter 6: Fractions
b. Factors of 18 = 1, 2, 3, 6, 9, 18 Common Factors
Factors of 21 = 1, 3, 7, 21 Warm Up
Common factors = 1, 3 2 6 1 7 2. a. 1 b. 2 c. 2 d. 1 e. 2 f. 3
9 18 3 21 3 4 4 2 4 5
Factors Factors g. 2 h. 1 i. 1 j. 2 k. 2 l. 2
of 18 of 21 4 4 2 4 3 4

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Answers