Volume of Liquid
The most common mistakes Singapore primary students make in Volume of Liquid, distilled from 73+ MOE-aligned questions across P2, P3, P5. Free practice at every level.
Top 10 mistakes in Volume of Liquid
- #1Partial logic
Divided 15 by 5 to get 3 but stopped there, forgetting to multiply by 3. Finding 1/5 of 15 is only the first step — the answer is 3/5, so multiply 3 by 3.
- #2Calc error
Found 1/5 of 15 correctly (15 ÷ 5 = 3), then multiplied by 2 instead of 3, giving 6. The numerator of the fraction is 3, not 2.
- #3Misconception
Subtracted 3 from 15 to get 12, thinking '3/5 full' means '3 litres less than full'. The fraction 3/5 means 3 out of every 5 equal parts, not 3 litres subtracted.
- #4Misconception
Mass of a teaspoon — too little for a pail.
- #5Misconception
Half a litre — a drink bottle, not a pail.
- #6Calc error
The student counted only 1 small division above the 200 ml mark. Each division = 25 ml, so 1 division above 200 ml gives 200 + 25 = 225 ml. The water is at the 3rd division: 200 + 3 × 25 = 275 ml.
- #7Calc error
The student counted only 2 small divisions above the 200 ml mark instead of 3. Each division = 25 ml, so 2 divisions above 200 ml gives 200 + 50 = 250 ml. The water level is at the 3rd division: 200 + 75 = 275 ml.
- #8Misconception
The student read the nearest labelled mark (300 ml) without counting the smaller divisions between 200 ml and 300 ml. Each small division between 200 ml and 250 ml represents 25 ml, and the water is 3 divisions above 200 ml, giving 200 + 75 = 275 ml.
- #9Misconception
Treated 2 L as only 1 L (forgetting the bottle holds 2 L, not 1 L): 1000 + 450 = 1450 ml, then made a small slip 1500 - 1450 = 50 ml. Used the wrong number of litres.
- #10Calc error
Forgot to add the 450 ml part of the bottle volume: used 2 L = 2000 ml only, then mis-subtracted 2000 - 1500 = 500, mis-recorded as 550.
Practise Volume of Liquid by level
- Primary 223 questions
- Primary 332 questions
- Primary 518 questions
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