Year 7 Angles Worksheet — Level 2 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 7 angles worksheet.
Success TutoringWorksheetsAnswer sheetYear 7 · Mathematics · AnglesYear 7 Angles Worksheet — Level 2 — Practice Set 3 — Answers
State the angle rule you use.
1.Two angles of a triangle are 106° and 23°. Find the third angle.
Answer: 51°
- Angles in a triangle add to 180°
- 180 − 106 − 23 = 51
2.Two angles of a triangle are 42° and 82°. Find the third angle.
Answer: 56°
- Angles in a triangle add to 180°
- 180 − 42 − 82 = 56
3.Two angles of a triangle are 81° and 66°. Find the third angle.
Answer: 33°
- Angles in a triangle add to 180°
- 180 − 81 − 66 = 33
4.Two angles on a straight line are 53° and x°. Find x.
Answer: x = 127
- Angles on a straight line add to 180°
- x = 180 − 53 = 127
5.Two angles on a straight line are 138° and x°. Find x.
Answer: x = 42
- Angles on a straight line add to 180°
- x = 180 − 138 = 42
6.Two angles on a straight line are 150° and x°. Find x.
Answer: x = 30
- Angles on a straight line add to 180°
- x = 180 − 150 = 30
7.Two angles of a triangle are 106° and 60°. Find the third angle.
Answer: 14°
- Angles in a triangle add to 180°
- 180 − 106 − 60 = 14
8.Two angles on a straight line are 140° and x°. Find x.
Answer: x = 40
- Angles on a straight line add to 180°
- x = 180 − 140 = 40
9.Two angles on a straight line are 95° and x°. Find x.
Answer: x = 85
- Angles on a straight line add to 180°
- x = 180 − 95 = 85
10.Two angles of a triangle are 23° and 56°. Find the third angle.
Answer: 101°
- Angles in a triangle add to 180°
- 180 − 23 − 56 = 101
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.