Percentage
The most common mistakes Singapore primary students make in Percentage, distilled from 107+ MOE-aligned questions across P5, P6. Free practice at every level.
Top 10 mistakes in Percentage
- #1Calc error
Wrong divisor.
- #2Misconception
You found 20% of 750 instead of 40%. 100% - 60% = 40%, not 20%.
- #3Calc error
You computed 750 - 500 by mistakenly using 500 as the girls (perhaps 2/3 of 750). 60% of 750 is 450, not 500.
- #4Misconception
450 is the number of GIRLS (60% of 750). The question asks for boys.
- #5Partial logic
$90 is the discounted price BEFORE adding GST. You forgot the 9% GST.
- #6Misconception
You added 9% GST to $120 ($120 + $10.80) and got close to $130.80, but rounded. The discount must come first.
- #7Calc error
Approximate. Re-set: original − 0.35 × original − 48 = 87 → 0.65 × original = 135 → original = 207.69 ≈ 208.
- #8Misconception
This treats the $48 as 35%. Apply 35% only to the original, then subtract $48 separately.
- #9Calc error
This solves 0.65 × original = 156 (= 87 + 69 incorrectly). Use 87 + 48 = 135 instead.
- #10Partial logic
Applied 10% decrease to the original $300 (= $270) and forgot the 20% increase entirely.
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- Primary 562 questions
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