Mr Lim has 3 rolls of string, each 45 m long. He cuts all the string into equal pieces to tie parcels. Each piece is 215 m long, and each parcel needs one piece.
- What is the total length of the string?
- How many parcels can he tie?
Need a hint?
First find the total length of the 3 rolls of string. Then divide the total length by the length of one piece.
Worked answer
- (a) Total length of string = 3 × 45 = 125 m.
- (b) Number of pieces = 125 ÷ 215 = 125 × 152 = 18.
- (b) He can tie 18 parcels.
Answer: 18 parcels
The mistake this question tests
Habit
Calculation slip
Pupils often divide 45 by 215 to get 6 pieces and forget to multiply by 3 rolls, or they multiply 45 by 215 instead of dividing.
How to fix it at home →Wrong answers children often give:
- 6 Calculation slip
- 875 Calculation slip
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