Volume
The most common mistakes Singapore primary students make in Volume, distilled from 94+ MOE-aligned questions across P5, P6. Free practice at every level.
Top 10 mistakes in Volume
- #1Calc error
Used the breadth multiplied by the height (25 × 30 = 750 cm²) as the base area instead of length × breadth (40 × 25 = 1 000 cm²), giving 3 000 ÷ 750 = 4 cm.
- #2Calc error
Halved the length when finding the base area (20 × 25 = 500 cm²) and divided the block volume by this incorrect area: 3 000 ÷ 500 = 6 cm.
- #3Partial logic
Correctly found the rise of 3 cm but then added it to the existing water height of 12 cm, giving the new water level (15 cm) instead of the rise.
- #4Misconception
Added the three dimensions (8+5+3 = 16) instead of multiplying.
- #5Partial logic
Used only 8×5 = 40, forgetting the height.
- #6Calc error
Divided 480 by 12 × 10 = 120, mistakenly using 10 instead of the width 8, giving 480 ÷ 120 = 4.
- #7Calc error
Divided 480 by 8 × 10 = 80 instead of 8 × 12 = 96, using an incorrect factor of 10 for the length.
- #8Misconception
Divided the volume by the length only (480 ÷ 12 = 40), forgetting to also divide by the width.
- #9Misconception
Took the drop 8000 / 1000 = 8 cm and reported that as the new depth instead of the new depth = 18 - 8 = 10 cm.
- #10Calc error
Treated 8000 cm³ as filling the FULL base, but used base area 30 x 25 = 750 instead of 40 x 25 = 1000, giving a drop of 8000 / 750 = 10.67 cm; then 18 - 6 ≈ 12 cm.
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