Mr Lim and Ms Koh are packing hygiene kits for a community clean-up day.
- Mr Lim pays $27.86 for the supplies using a $50.00 note. How much change should he receive?
- Each kit is tied with 1.65 m of string. How much string is needed for 2000 kits?
Need a hint?
For (a), rewrite the amounts in cents. For (b), split 2000 into 2 and 1000.
Worked answer
- (a) $50.00 − $27.86 = $22.14. Mr Lim should receive $22.14 change.
- (b) 1.65 m × 2000 = 1.65 × 2 × 1000.
- 1.65 × 2 = 3.3, and 3.3 × 1000 = 3300.
- 3300 m of string is needed for 2000 kits.
Answer: 3300 m
The mistake this question tests
Habit
Calculation slip
Some pupils forget to reduce the whole-dollar amount when borrowing for the cents in (a), while others multiply 1.65 by 2 only in (b).
How to fix it at home →Wrong answers children often give:
- 330 Calculation slip
- 3.3 Calculation slip
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See the answer →Practise PSLE decimals until the mistakes stop.
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