Angles
The most common mistakes Singapore primary students make in Angles, distilled from 165+ MOE-aligned questions across P3, P4, P5, P6. Free practice at every level.
Top 10 mistakes in Angles
- #1Calc error
Missed one corner.
- #2Misconception
Straight = 180°.
- #3Misconception
A pentagon has 5 corners, not 4. Even if some corners are right angles, a regular pentagon has angles of 108° at each corner, not 90°.
- #4Misconception
A triangle has only 3 corners, not 4. Even if one corner is a right angle, a triangle can never have 4 right angles.
- #5Misconception
A trapezium has 4 corners but typically only 2 are right angles (in a right trapezium). Not all 4 corners of a trapezium are right angles.
- #6Misconception
You read off the OUTER scale (which goes the opposite way) instead of the INNER scale. The question says one arm lines up with 0° on the INNER scale, so you must read the inner scale at the other arm. The outer scale shows 45° at the same spot, but the correct reading is 135°.
- #7Calc error
You computed 180° − 125° or read the outer scale and added 10°. The correct reading is the value on the inner scale where the second arm lands, which is 135°.
- #8Calc error
You misread the scale by 10°. The arm points to the 135° mark, not 145°. Take care to read the exact line on the protractor, not one tick further.
- #9Calc error
You used 90° − 55° = 35° instead of 145° − 90°. The 145° angle is the WHOLE that is being split into 90° (pole-to-ground) and the unknown part. So unknown = 145° − 90° = 55°, not 35°.
- #10Calc error
You may have computed 155° − 90° = 65° (using 155 instead of 145). Reread the question: the total angle is 145°, not 155°. So 145° − 90° = 55°, not 65°.
Practise Angles by level
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- Primary 435 questions
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