Ivan had a rope of length 423 m. He used 34 of the rope to make a model. Find the length of the rope that was left.
Need a hint?
Work out what fraction of the rope is left first. Then find that fraction of the total length, and write the answer as a mixed number.
Worked answer
- Fraction left = 1 − 34 = 14 of the rope.
- Length left = 14 × 423 = 14 × 143 = 1412 = 76 m.
- 76 = 116 m.
Answer: 1 1/6 m
The mistake this question tests
Habit
Fraction of a remainder
Pupils subtract 34 from 423 directly, or find 34 of the rope and forget to subtract it from the total, giving the length used instead of the length left.
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