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Primary 4 Mathematics · Chapter 2 · Answers and explanations

Lesson 2.4: Multiples (answers)

Section A · Multiple choice 4 marks

1. Which of these is a multiple of 7?1 mark

(A) 58(B) 65(C) 75(D) 56
Answer: (D) 567 × 8 = 56, so 56 is a multiple of 7. Count in 7s: 7, 14, 21, 28, 35, 42, 49, 56.

2. What is the 5th multiple of 6?1 mark

(A) 30(B) 11(C) 36(D) 24
Answer: (A) 30Count in 6s five times: 6, 12, 18, 24, 30. Or 6 × 5 = 30.

3. Which of these is NOT a multiple of 9?1 mark

(A) 27(B) 56(C) 45(D) 72
Answer: (B) 569 × 3 = 27, 9 × 5 = 45 and 9 × 8 = 72. But 9 × 6 = 54 and 9 × 7 = 63, so 56 is skipped.

4. The number line shows counting in 4s. Which number does the ? stand for?1 mark

0+44+48+412+416+420+424+428
(A) 18(B) 22(C) 20(D) 24
Answer: (C) 20The jumps are +4 each time: 0, 4, 8, 12, 16, 20, 24, 28. The ? is 20.

Section B · Write your answer 11 marks

5. Write the first five multiples of 8.1 mark

Answer: 8, 16, 24, 32, 40Count in 8s: 8, 16, 24, 32, 40.

6. What is the 12th multiple of 4?1 mark

Answer: 484 × 12 = 48.

7. Is 91 a multiple of 7? Show how you know.1 mark

Answer: Yes, 7 × 13 = 917 × 13 = 91, so 91 is a multiple of 7. (Check: 91 ÷ 7 = 13 with no remainder.)

8. The multiples of 6 are shaded on the grid. What is the next multiple of 6 after 36?1 mark

12345678910111213141516171819202122232425262728293031323334353637383940
Answer: 42The shaded numbers go up by 6 each time: 6, 12, 18, 24, 30, 36. The next is 36 + 6 = 42.

9. What is the smallest multiple of 9 that is greater than 100?1 mark

Answer: 1089 × 11 = 99, which is less than 100. 9 × 12 = 108, which is greater than 100. The answer is 108.

10. I am a multiple of 6 between 40 and 60. The sum of my digits is 9. What number am I?2 marks

Answer: 54Multiples of 6 between 40 and 60: 42, 48, 54. Digit sums: 4 + 2 = 6, 4 + 8 = 12, 5 + 4 = 9. I am 54.

11. List all the multiples of 7 that are between 50 and 80.2 marks

Answer: 56, 63, 70, 777 × 7 = 49 is too small. Count on in 7s: 56, 63, 70, 77. The next is 84, which is too big.

12. Mei saves $8 every week. After how many weeks will she first have more than $100?2 marks

Answer: 13 weeks8 × 12 = 96, which is not more than $100. 8 × 13 = 104, which is more than $100. So it takes 13 weeks.
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