At Mr Lim's market stall, there were 45 bags of rice. He sold 49 of the bags. How many bags of rice were left?
Need a hint?
Find the size of one part using 45 ÷ 9, then work out how many of the 9 parts are left.
Worked answer
- Divide 45 bags of rice into 9 equal parts: 45 ÷ 9 = 5 bags in each part.
- He sold 4 parts: 4 × 5 = 20 bags.
- Bags left = 45 − 20 = 25 bags.
Answer: 25 bags
The mistake this question tests
Habit
Calculation slip
A pupil may divide 45 by 9 and subtract only 1 part from the whole, giving 40 instead of finding the remaining 5 parts.
How to fix it at home →Wrong answers children often give:
- 20 Calculation slip
- 40 Stopped at one part in ratio
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See the answer →Practise PSLE fractions until the mistakes stop.
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