Primary 4 Mathematics · Chapter 10 · Answers and explanations

Lesson 10.5: Division of Decimals (answers)

Section A · Multiple choice 4 marks

1. 0.8 ÷ 2 = ?1 mark

(A) 4(B) 0.04(C) 0.4(D) 0.2

Answer: (C) 0.48 tenths ÷ 2 = 4 tenths = 0.4.

2. 4.8 ÷ 3 = ?1 mark

(A) 16(B) 1.2(C) 0.16(D) 1.6

Answer: (D) 1.64 ones ÷ 3 = 1 one remainder 1. 1 one 8 tenths = 18 tenths. 18 tenths ÷ 3 = 6 tenths. So 1.6.

3. 7.5 ÷ 5 = ?1 mark

(A) 1.5(B) 15(C) 1.05(D) 0.15

Answer: (A) 1.57 ones ÷ 5 = 1 one remainder 2. 2 ones 5 tenths = 25 tenths. 25 ÷ 5 = 5 tenths. So 1.5.

4. 9.12 ÷ 4 = ?1 mark

(A) 2.82(B) 2.28(C) 2.38(D) 22.8

Answer: (B) 2.289 ÷ 4 = 2 remainder 1. 11 tenths ÷ 4 = 2 remainder 3. 32 hundredths ÷ 4 = 8. So 2.28.

5. 0.06 ÷ 2 = ______1 mark

Answer: 0.036 hundredths ÷ 2 = 3 hundredths = 0.03.

6. 8.4 ÷ 6 = ______1 mark

Answer: 1.48 ÷ 6 = 1 remainder 2. 24 tenths ÷ 6 = 4 tenths. So 1.4.

7. 5.04 ÷ 7 = ______1 mark

Answer: 0.720 ones. 50 tenths ÷ 7 = 7 tenths remainder 1. 14 hundredths ÷ 7 = 2 hundredths. So 0.72.

8. 3 ÷ 4 = ______1 mark

Answer: 0.753 ÷ 4 = 0 remainder 3. 30 tenths ÷ 4 = 7 tenths remainder 2. 20 hundredths ÷ 4 = 5. So 0.75.

9. 17 ÷ 5 = ______1 mark

Answer: 3.417 ÷ 5 = 3 remainder 2. 20 tenths ÷ 5 = 4 tenths. So 3.4.

10. 36.4 ÷ 8 = ______2 marks

Answer: 4.5536 ÷ 8 = 4 remainder 4. 44 tenths ÷ 8 = 5 remainder 4. 40 hundredths ÷ 8 = 5. So 4.55.

11. 5 ÷ 6 = ______ (correct to 1 decimal place)2 marks

Answer: 0.85 ÷ 6 = 0.833... The 2nd decimal place is 3, so round down. 0.8.

12. 10 ÷ 3 = ______ (correct to 2 decimal places)2 marks

Answer: 3.3310 ÷ 3 = 3.333... The 3rd decimal place is 3, so round down. 3.33.

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