Primary 4 Mathematics · Chapter 10 · Answers and explanations
Lesson 10.3: Word Problems: Adding and Subtracting (answers)
Section A · Multiple choice 4 marks
1. Nina walks 3.25 km to the park and then 1.8 km to the library. How far does she walk in all?1 mark
(A) 5.05 km(B) 1.45 km(C) 5.43 km(D) 4.43 km
Answer: (A) 5.05 kmAdd the parts: 3.25 + 1.80 = 5.05. She walks 5.05 km.
2. Ben has $12.60. He spends $4.35. How much money does he have left?1 mark
(A) $16.95(B) $8.25(C) $8.35(D) $7.25
Answer: (B) $8.25Subtract: 12.60 − 4.35 = 8.25. He has $8.25 left.
3. Ribbon A is 7.5 m long. It is 2.25 m longer than Ribbon B. How long is Ribbon B?1 mark
(A) 9.75 m(B) 5.35 m(C) 5.25 m(D) 4.25 m
Answer: (C) 5.25 mRibbon B is shorter, so subtract: 7.50 − 2.25 = 5.25. Ribbon B is 5.25 m long.
4. A pumpkin has a mass of 4.8 kg. A melon has a mass of 6.35 kg. How much heavier is the melon?1 mark
(A) 11.15 kg(B) 2.55 kg(C) 1.45 kg(D) 1.55 kg
Answer: (D) 1.55 kgCompare, so subtract: 6.35 − 4.80 = 1.55. The melon is 1.55 kg heavier.
Section B · Write your answer 11 marks
5. Two bags have masses of 2.45 kg and 3.8 kg. What is their total mass?1 mark
Answer: 6.25 kgAdd: 2.45 + 3.80 = 6.25. The total mass is 6.25 kg.
6. A jug had 3.5 ℓ of juice. 1.75 ℓ were poured out. How much juice is left?1 mark
Answer: 1.75 ℓSubtract: 3.50 − 1.75 = 1.75. There is 1.75 ℓ left.
7. A book costs $8.90 and a pen costs $2.65. What is the total cost?1 mark
Answer: $11.55Add: 8.90 + 2.65 = 11.55. The total cost is $11.55.
8. Tom pays $20 for a toy that costs $13.45. How much change does he get?1 mark
Answer: $6.55Subtract: 20.00 − 13.45 = 6.55. His change is $6.55.
9. A train ride is 12.6 km. A bus ride is 4.75 km longer than the train ride. How long is the bus ride?1 mark
Answer: 17.35 kmLonger, so add: 12.60 + 4.75 = 17.35. The bus ride is 17.35 km.
10. Sara has 18.5 m of cloth. She uses 6.75 m for curtains and 4.9 m for cushions. How much cloth is left?2 marks
Answer: 6.85 mCloth used: 6.75 + 4.90 = 11.65. Cloth left: 18.50 − 11.65 = 6.85. She has 6.85 m left.
11. Amy has a mass of 14.25 kg. Bob is 3.6 kg lighter than Amy. What is the total mass of Amy and Bob?2 marks
Answer: 24.9 kgBob: 14.25 − 3.60 = 10.65 kg. Total: 14.25 + 10.65 = 24.90. The total mass is 24.9 kg.
12. A tank holds 10 ℓ. Wayne pours in 2.85 ℓ and then 4.76 ℓ of water. How much more water is needed to fill the tank?2 marks
Answer: 2.39 ℓWater poured in: 2.85 + 4.76 = 7.61. Water needed: 10.00 − 7.61 = 2.39. He needs 2.39 ℓ more.
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