Mathematics

Area of Triangle

The most common mistakes Singapore primary students make in Area of Triangle, distilled from 57+ MOE-aligned questions across P5. Free practice at every level.

From the question bank

Top 5 mistakes in Area of Triangle

  1. #1Misconception

    Forgot to multiply by ½. Area of a triangle = ½ × base × height, not base × height.

    Seen in 2 questions

  2. #2Partial logic

    You gave the area of triangle DPC (the smaller triangle), not triangle APB.

    Seen in 1 question

  3. #3Misconception

    You assumed P sits at the midpoint between AB and DC, giving each triangle the same height of 4 cm: ½ × 12 × 4 = 24. The condition 'APB is twice DPC' means the heights split BC in a 2 : 1 ratio.

    Seen in 1 question

  4. #4Misconception

    You gave half the rectangle area (96 ÷ 2). Triangles APB + DPC together cover only half the rectangle, but APB alone is 2/3 of that half = 32 cm² — not the whole half.

    Seen in 1 question

  5. #5Calc error

    Computed the area of the cut-out triangle (½ × 8 × 6 = 24 cm²) and the area of the rectangle (12 × 8 = 96 cm²), then subtracted twice (96 − 24 − 24 = 48).

    Seen in 1 question

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