Priya has a ribbon that is 314 metres long. She cuts off 0.6 metres from the end. Which mixed number shows the length of the ribbon left, in metres, in simplest form?
- 2 7/20
- 2 3/5
- 2 13/20
- 3 17/20
Need a hint?
Change 314 to a decimal first, then subtract 0.6. Check your subtraction by lining up the decimal points.
Worked answer
- 314 = 3.25 (since 1/4 = 0.25)
- Length left = 3.25 − 0.6 = 2.65
- 2.65 = 265/100 = 2 65/100 = 2 13/20 in simplest form
Answer: 2 13/20 metres
The mistake this question tests
Habit
Calculation slip
Pupils who add the 0.6 instead of subtracting it get 3 13/20, or who make a borrowing slip (3.25 − 0.6 = 2.35) get 2 7/20.
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