Primary 4 Mathematics · Chapter 10 · Answers and explanations
Lesson 10.6: Word Problems: Multiplying and Dividing (answers)
Section A · Multiple choice 4 marks
1. A book costs $3.85. How much do 4 books cost?1 mark
(A) $12.40(B) $7.85(C) $154(D) $15.40
Answer: (D) $15.40Equal groups, so multiply: 3.85 × 4 = 15.40. They cost $15.40.
2. A 7.5 m rope is cut into 5 equal pieces. How long is each piece?1 mark
(A) 1.5 m(B) 2.5 m(C) 0.15 m(D) 15 m
Answer: (A) 1.5 mDivide: 7.5 ÷ 5 = 1.5. Each piece is 1.5 m.
3. Mia buys 6 bottles of juice. Each bottle holds 1.25 ℓ. How much juice does she buy?1 mark
(A) 6.25 ℓ(B) 7.5 ℓ(C) 7.25 ℓ(D) 75 ℓ
Answer: (B) 7.5 ℓMultiply: 1.25 × 6 = 7.50. She buys 7.5 ℓ.
4. 18.6 kg of sand is shared equally among 3 boxes. How much sand is in each box?1 mark
(A) 62 kg(B) 5.2 kg(C) 6.2 kg(D) 6.02 kg
Answer: (C) 6.2 kgDivide: 18.6 ÷ 3 = 6.2. Each box has 6.2 kg.
Section B · Write your answer 11 marks
5. Eight pencils cost $0.65 each. How much do they cost altogether?1 mark
Answer: $5.200.65 × 8 = 5.20. They cost $5.20.
6. A 12.8 m wire is cut into 4 equal pieces. How long is each piece?1 mark
Answer: 3.2 m12.8 ÷ 4 = 3.2. Each piece is 3.2 m.
7. Bag A has a mass of 2.45 kg. Bag B is 3 times as heavy as Bag A. What is the mass of Bag B?1 mark
Answer: 7.35 kg2.45 × 3 = 7.35. Bag B has a mass of 7.35 kg.
8. A packet holds 0.75 kg of rice. How much rice is in 6 packets?1 mark
Answer: 4.5 kg0.75 × 6 = 4.50. There is 4.5 kg of rice.
9. $54.60 is shared equally among 7 children. How much does each child get?1 mark
Answer: $7.8054.60 ÷ 7 = 7.80. Each child gets $7.80.
10. Mr Roy buys 5 pens at $2.40 each. He pays with a $20 note. How much change does he get?2 marks
Answer: $8Cost: 2.40 × 5 = 12.00. Change: 20 − 12 = 8. His change is $8.
11. Peter’s rope is 4 times as long as Sam’s rope. Together the two ropes are 15.5 m long. How long is Peter’s rope?2 marks
Answer: 12.4 mSam = 1 unit, Peter = 4 units, together 5 units = 15.5 m. 1 unit = 15.5 ÷ 5 = 3.1 m. Peter: 4 × 3.1 = 12.4 m.
12. Ali saves $3.75 each week for 8 weeks. He then spends $12.50. How much money does he have left?2 marks
Answer: $17.50Saved: 3.75 × 8 = 30.00. Left: 30.00 − 12.50 = 17.50. He has $17.50.
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