Geometry
The most common mistakes Singapore primary students make in Geometry, distilled from 155+ MOE-aligned questions across P3, P4, P5, P6. Free practice at every level.
Top 10 mistakes in Geometry
- #1Misconception
Meet at vertex B — perpendicular, not parallel.
- #2Misconception
Meet at vertex A — perpendicular, not parallel.
- #3Partial logic
BC∥DA is correct, but 'only' is wrong; AB∥CD also.
- #4Partial logic
Counted only the horizontal bars (2) and forgot that each horizontal bar pairs with each vertical bar separately.
- #5Calc error
Added the number of horizontal bars (2) and vertical bars (2), then subtracted 1, giving 2 + 2 − 1 = 3, instead of multiplying.
- #6Partial logic
This answer finds the sum of one of each pair of faces (lb + bh + lh = 160 + 224 + 560 = 944) but forgets that a cuboid has 6 faces arranged in 3 identical pairs — the total must be multiplied by 2.
- #7Partial logic
This answer adds only the top/bottom faces and the two long side faces: 2(20 × 8) + 2(20 × 28) = 320 + 1120 = 1440. It leaves out the two short side faces (8 × 28), which are also part of the net.
- #8Partial logic
This answer includes the two short side faces and the two long side faces: 2(8 × 28) + 2(20 × 28) = 448 + 1120 = 1568. It leaves out the two top and bottom faces (20 × 8), which are also part of the net.
- #9Misconception
Different views of a rectangular prism show different 2D shapes depending on the viewing angle.
- #10Misconception
The front view is not always a square; it depends on the prism's dimensions.
Practise Geometry by level
- Primary 318 questions
- Primary 472 questions
- Primary 543 questions
- Primary 622 questions
Practise every Geometry question — plus 75,000+ across all PSLE topics — with full worked solutions and misconception-specific feedback on Superholic Lab.
Start Free Trial — 7 Days FreeBrowse all PSLE topics →