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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 90 · 40 sums
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The method (Know the totals): Acute < 90°, right = 90°, obtuse between 90° and 180°, straight = 180°. On a straight line: the two angles add up to 180°. In a triangle: the three angles add up to 180°. Around a point: 360°. Clock: each hour mark is 30° apart (360° ÷ 12).

NameDateTime takenScore ___ / 40
  1. 1.Two angles of a triangle are 20° and 105°. What is the third angle (in degrees)?
  2. 2.An angle measures 85°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  3. 3.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  4. 4.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  5. 5.Two angles of a triangle are 55° and 110°. What is the third angle (in degrees)?
  6. 6.Three angles meet at a point. Two of them are 100° and 100°. What is the third angle (in degrees)?
  7. 7.Two angles of a triangle are 80° and 85°. What is the third angle (in degrees)?
  8. 8.Three angles meet at a point. Two of them are 150° and 60°. What is the third angle (in degrees)?
  9. 9.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  10. 10.Two angles of a triangle are 60° and 105°. What is the third angle (in degrees)?
  11. 11.Two angles together make a straight line. One of them is 75°. What is the other angle (in degrees)?
  12. 12.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  13. 13.An angle measures 115°. What kind of angle is it? (a) Obtuse (b) Straight (c) Acute
  14. 14.Three angles meet at a point. Two of them are 120° and 80°. What is the third angle (in degrees)?
  15. 15.Two angles together make a straight line. One of them is 85°. What is the other angle (in degrees)?
  16. 16.Two angles of a triangle are 60° and 100°. What is the third angle (in degrees)?
  17. 17.An angle measures 90°. What kind of angle is it? (a) Right (b) Straight (c) Obtuse
  18. 18.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  19. 19.An angle measures 180°. What kind of angle is it? (a) Obtuse (b) Straight (c) Acute
  20. 20.Three angles meet at a point. Two of them are 90° and 120°. What is the third angle (in degrees)?
  21. 21.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  22. 22.Two angles of a triangle are 65° and 30°. What is the third angle (in degrees)?
  23. 23.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  24. 24.Three angles meet at a point. Two of them are 140° and 50°. What is the third angle (in degrees)?
  25. 25.An angle measures 140°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  26. 26.An angle measures 160°. What kind of angle is it? (a) Right (b) Obtuse (c) Straight
  27. 27.Two angles of a triangle are 75° and 35°. What is the third angle (in degrees)?
  28. 28.Two angles of a triangle are 75° and 80°. What is the third angle (in degrees)?
  29. 29.Three angles meet at a point. Two of them are 70° and 90°. What is the third angle (in degrees)?
  30. 30.An angle measures 35°. What kind of angle is it? (a) Acute (b) Right (c) Straight
  31. 31.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  32. 32.Three angles meet at a point. Two of them are 60° and 200°. What is the third angle (in degrees)?
  33. 33.A right angle is split into two angles. One of them is 50°. What is the other angle (in degrees)?
  34. 34.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  35. 35.Two angles of a triangle are 60° and 45°. What is the third angle (in degrees)?
  36. 36.Two angles of a triangle are 95° and 25°. What is the third angle (in degrees)?
  37. 37.Two angles of a triangle are 35° and 30°. What is the third angle (in degrees)?
  38. 38.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  39. 39.Three angles meet at a point. Two of them are 120° and 140°. What is the third angle (in degrees)?
  40. 40.Three angles meet at a point. Two of them are 50° and 50°. What is the third angle (in degrees)?

Answer key

  1. 55
  2. Acute
  3. 30
  4. 90
  5. 15
  6. 160
  7. 15
  8. 150
  9. 30
  10. 15
  11. 105
  12. 150
  13. Obtuse
  14. 160
  15. 95
  16. 20
  17. Right
  18. 85
  19. Straight
  20. 150
  21. 60
  22. 85
  23. 120
  24. 170
  25. Obtuse
  26. Obtuse
  27. 70
  28. 25
  29. 200
  30. Acute
  31. 80
  32. 100
  33. 40
  34. 55
  35. 75
  36. 60
  37. 115
  38. 35
  39. 100
  40. 260

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