Used C = πr instead of C = 2πr. Forgot the factor of 2.
PRIMARY 6 · MATHEMATICS
Circles
Top 5 mistakes
Ranked by how often they appear across 64 MOE-aligned practice questions in our archive.
Used radius as if it were diameter: 2 × 22/7 × 14 = 88.
Computed AREA (πr² = 154) instead of circumference.
Used the path width 7 as a circle radius: π x 7² = 22/7 x 49 = 154 m².
Computed the AREA OF THE POND only: π x 14² = 22/7 x 196 = 616 m², treating that as the path area.
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