中文（繁體）
中文（简体）
English
P5 Maths: Measuring and Estimating Angles (Paper 1 (basics))
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 1 (basics))
Paper 1 (basics): 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)
- FoundationHow many degrees are there in a right angle?
- FoundationHow many degrees are there in a straight angle?
- FoundationHow many degrees are there in one full turn about a point?
- IntermediateAn angle and an angle of 35 degrees together make a right angle. How many degrees is that angle?
- IntermediateAn angle and an angle of 120 degrees together make a straight angle. How many degrees is that angle?
- IntermediateA protractor is placed with one arm on the 0-degree mark and the other arm reads 68 on the same scale. How many degrees is the angle?
- ChallengeThree angles lie on a straight line. Two of them are 45 degrees and 70 degrees. How many degrees is the third angle?
- ChallengeFour angles meet at a point. Three of them are 90, 110 and 85 degrees. How many degrees is the fourth angle?
- ChallengeWhat kind of angle is an angle of 155 degrees?
- Error redoA student answered that a straight angle is 90 degrees. What is the correct number of degrees?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 90 degrees | A right angle is one quarter of a full turn. |
| 2 | 180 degrees | The two arms of a straight angle lie on one straight line. |
| 3 | 360 degrees | A full turn is 360 degrees, which equals four right angles. |
| 4 | 55 degrees | Subtract 35 from 90 to get 55. |
| 5 | 60 degrees | Subtract 120 from 180 to get 60. |
| 6 | 68 degrees. | Read the scale that starts at 0 on the arm, and never mix the two scales. |
| 7 | 65 degrees | Angles on a straight line add up to 180, so 180 minus 45 minus 70 is 65. |
| 8 | 75 degrees | Angles about a point add up to 360, so 360 minus the three angles is 75. |
| 9 | An obtuse angle. | An angle greater than 90 degrees but less than 180 degrees is obtuse. |
| 10 | 180 degrees | 90 degrees is a right angle; a straight angle is twice that, so 180 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.