Length and Mass
The most common mistakes Singapore primary students make in Length and Mass, distilled from 93+ MOE-aligned questions across P1, P2, P3, P5. Free practice at every level.
Top 10 mistakes in Length and Mass
- #1Calc error
5th mark = 500.
- #2Calc error
Subtract not add.
- #3Misconception
Not digit addition.
- #4Misconception
The student counted only the 3 marks after the 10 cm line, reading 10, 11, 12, 13 as 3 instead of reading the full measurement of 13 cm.
- #5Misconception
The student misread the ruler and stopped at the 8 cm mark instead of following the pencil all the way to its tip at 13 cm.
- #6Calc error
The student added 5 extra centimetres, reading 13 + 5 = 18 cm, perhaps counting past the tip of the pencil.
- #7Misconception
The student used 100 cm for 2 m instead of 200 cm, then calculated 100 - 75 = 25 cm. This shows confusion about how many centimetres are in 1 metre.
- #8Calc error
The student correctly converted 2 m to 200 cm but subtracted 10 cm too many, calculating 200 - 85 = 115 cm instead of 200 - 75 = 125 cm.
- #9Misconception
Mass of a small coin — far too light.
- #10Misconception
Small biscuit — too light.
Practise Length and Mass by level
- Primary 123 questions
- Primary 227 questions
- Primary 330 questions
- Primary 513 questions
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