PRIMARY 3 · MATHEMATICS

Area and Perimeter
Top 5 mistakes

Ranked by how often they appear across 28 MOE-aligned practice questions in our archive.

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#1Misconception

That is area.

Seen in 2 questions

#2Partial logic

Right number, wrong unit.

Seen in 2 questions

#3Misconception

Added only one length and one width: 12 + 8 = 20. Forgot that perimeter goes all the way around — a rectangle has two lengths and two widths.

Seen in 1 question

#4Calculation error

Added all four sides but used 16 instead of 8 for the second width: 12 + 8 + 12 + 16 = 48.

Seen in 1 question

#5Misconception

Multiplied length × width to find area instead of perimeter: 12 × 8 = 96. The question asks for the distance around (perimeter), not the space inside (area).

Seen in 1 question

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