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Primary 4 Mathematics · Chapter 6 · Answers and explanations

Lesson 6.1: Recall: Adding and Subtracting Fractions (answers)

Section A · Multiple choice 4 marks

1. Find the value of 38 + 28.1 mark

382858
(A) 58(B) 516(C) 18(D) 68
Answer: (A) 58The denominators are the same, so add the numerators: 3 + 2 = 5. The answer is 58. (Do not add the denominators!)

2. Find the value of 12 + 14.1 mark

1214
(A) 26(B) 34(C) 12(D) 16
Answer: (B) 34Change 12 to quarters: 12 = 24. Then 24 + 14 = 34.

3. Find the value of 710 − 25.1 mark

(A) 12(B) 55(C) 310(D) 35
Answer: (C) 310Change 25 to tenths: 25 = 410. Then 710 − 410 = 310.

4. Find the value of 56 − 13.1 mark

(A) 43(B) 46(C) 13(D) 12
Answer: (D) 1213 = 26. 56 − 26 = 36. Simplify: 36 = 12.

Section B · Write your answer 11 marks

5. Find the value of 29 + 49. Give your answer in the simplest form.1 mark

Answer: 2329 + 49 = 69. Divide the top and bottom by 3: 69 = 23.

6. Find the value of 34 + 18.1 mark

Answer: 7834 = 68. 68 + 18 = 78.

7. Find the value of 910 − 35.1 mark

Answer: 31035 = 610. 910 − 610 = 310.

8. Find the value of 16 + 23.1 mark

Answer: 5623 = 46. 16 + 46 = 56.

9. Find the value of 78 − 12.1 mark

3878
Answer: 3812 = 48. 78 − 48 = 38.

10. Find the sum of 12, 14 and 18.2 marks

Answer: 78Change all to eighths: 12 = 48, 14 = 28.
48 + 28 + 18 = 78.

11. 35 + ? = 910. Find the missing number.2 marks

Answer: 310Subtract: 910 − 35.
35 = 610, so 910 − 610 = 310.
Check: 610 + 310 = 910.

12. Mei ate 14 of a pizza and Raj ate 38 of the pizza. What fraction of the pizza did they eat? What fraction of the pizza was left?2 marks

Pizza381438
Answer: 58 eaten; 38 leftEaten: 14 = 28, so 28 + 38 = 58.
Left: 1 − 58 = 88 − 58 = 38.
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