Nina's blue ribbon is 5.6 cm long. She places it next to a centimetre ruler with one end at the 3 cm mark. At which mark does the other end lie?
Need a hint?
Start at the 3 cm mark and move right by the length of the ribbon.
Worked answer
- One end of the ribbon is at the 3 cm mark.
- The other end is 5.6 cm further along: 3 + 5.6 = 8.6.
- The other end lies at the 8.6 cm mark.
Answer: 8.6 cm
The mistake this question tests
Habit
Calculation slip
A pupil may give 5.6 cm, which is the ribbon's length, instead of the ruler mark at its other end.
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See the answer →Practise PSLE measurement until the mistakes stop.
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