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P5 Maths: Measuring and Estimating Angles (Paper 4 (error clinic))
Tutor Prep Guide · Protractor readings, right, straight and full angles, complementary and supplementary angles, angles on a line and about a point, vertically opposite angles and estimating angles
P5 Maths: Measuring and Estimating Angles (Paper 4 (error clinic))
Paper 4 (error clinic): ten angle questions on protractor readings, right, straight and full angles, complementary and supplementary angles, with answers and one-line notes.
Direct answers Level: P5 maths; format: protractor readings, right, straight and full angles, complementary and supplementary angles, angles on a line and about a point, and estimating angles.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 20 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: P5 Maths: Measuring and Estimating Angles |
| Level | P5 |
02 Questions (10 items)
- FoundationAn angle and an angle of 52 degrees make a right angle. How many degrees is that angle?
- FoundationTake a right angle away from a straight angle. How many degrees are left?
- FoundationTake a straight angle away from a full turn. How many degrees are left?
- IntermediateThree angles on a straight line are 110 degrees, x and 25 degrees. Find x.
- IntermediateFour angles about a point are 100, 80, 60 and x degrees. Find x.
- IntermediateTwo straight lines cross and one angle is 65 degrees. How many degrees is its vertically opposite angle?
- ChallengeTwo angles add up to 180 degrees and differ by 30 degrees. How many degrees is the smaller angle?
- ChallengeWhat is the angle between the hands at six o clock exactly?
- ChallengeA right angle is split into three equal angles. How many degrees do two of them make together?
- Error redoA student called an angle of 45 degrees obtuse. What is the correct name?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 38 degrees | 90 minus 52 is 38. |
| 2 | 90 degrees | 180 minus 90 is 90 degrees. |
| 3 | 180 degrees | 360 minus 180 is 180 degrees. |
| 4 | 45 degrees | 180 minus 110 minus 25 is 45. |
| 5 | 120 degrees | 360 minus 100 minus 80 minus 60 is 120. |
| 6 | 65 degrees. | Vertically opposite angles are equal, so the opposite angle is also 65 degrees. |
| 7 | 75 degrees | 180 minus 30, then divide by 2, gives 75 degrees. |
| 8 | 180 degrees | At six o clock the hands point in opposite directions, six spaces apart, and 6 times 30 is 180 degrees. |
| 9 | 60 degrees | 90 divided by 3 is 30, so two of these angles make 60 degrees. |
| 10 | An acute angle. | An angle smaller than 90 degrees is acute; an obtuse angle must be greater than 90 degrees. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
Check the answers; for a wrong item, confirm whether the total is 180 or 360 degrees, then work it again.Tutor Registration →
Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.