PRIMARY 4 · MATHEMATICS

Decimals
Top 5 mistakes

Ranked by how often they appear across 109 MOE-aligned practice questions in our archive.

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#1Partial logic

Not simplified.

Seen in 4 questions

#2Misconception

Did not round.

Seen in 2 questions

#3Calculation error

This divides 75 by 25 correctly (75 ÷ 25 = 3) but divides 100 by 20 instead of 25 (100 ÷ 20 = 5). Both numerator and denominator must be divided by the same number.

Seen in 1 question

#4Misconception

This writes the digits 7 and 5 as numerator and denominator without using place value. 0.75 has two decimal places so the denominator must be 100.

Seen in 1 question

#5Partial logic

0.75 = 75/100 is correct as a fraction but not in simplest form. Divide both numerator and denominator by their HCF of 25: 75 ÷ 25 = 3 and 100 ÷ 25 = 4, giving 3/4.

Seen in 1 question

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