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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 720 · 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.Three angles meet at a point. Two of them are 140° and 150°. What is the third angle (in degrees)?
  2. 2.Two angles of a triangle are 85° and 75°. What is the third angle (in degrees)?
  3. 3.An angle measures 100°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  4. 4.Two angles together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  5. 5.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  6. 6.Two angles together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  7. 7.An angle measures 180°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  8. 8.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  9. 9.An angle measures 25°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  10. 10.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  11. 11.An angle measures 90°. What kind of angle is it? (a) Obtuse (b) Straight (c) Right
  12. 12.Three angles meet at a point. Two of them are 90° and 170°. What is the third angle (in degrees)?
  13. 13.Two angles together make a straight line. One of them is 35°. What is the other angle (in degrees)?
  14. 14.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  15. 15.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  16. 16.An angle measures 95°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  17. 17.Two angles of a triangle are 55° and 115°. What is the third angle (in degrees)?
  18. 18.Two angles of a triangle are 100° and 35°. What is the third angle (in degrees)?
  19. 19.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  20. 20.Two angles together make a straight line. One of them is 65°. What is the other angle (in degrees)?
  21. 21.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  22. 22.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  23. 23.Three angles meet at a point. Two of them are 140° and 160°. What is the third angle (in degrees)?
  24. 24.An angle measures 110°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  25. 25.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  26. 26.Two angles of a triangle are 20° and 60°. What is the third angle (in degrees)?
  27. 27.Two angles of a triangle are 40° and 45°. What is the third angle (in degrees)?
  28. 28.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  29. 29.Two angles of a triangle are 45° and 65°. What is the third angle (in degrees)?
  30. 30.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  31. 31.Three angles meet at a point. Two of them are 130° and 70°. What is the third angle (in degrees)?
  32. 32.Two angles together make a straight line. One of them is 130°. What is the other angle (in degrees)?
  33. 33.Three angles meet at a point. Two of them are 60° and 160°. What is the third angle (in degrees)?
  34. 34.Three angles meet at a point. Two of them are 120° and 90°. What is the third angle (in degrees)?
  35. 35.A right angle is split into two angles. One of them is 45°. What is the other angle (in degrees)?
  36. 36.A right angle is split into two angles. One of them is 30°. What is the other angle (in degrees)?
  37. 37.Two angles of a triangle are 45° and 30°. What is the third angle (in degrees)?
  38. 38.Two angles of a triangle are 20° and 105°. What is the third angle (in degrees)?
  39. 39.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  40. 40.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?

Answer key

  1. 70
  2. 20
  3. Obtuse
  4. 170
  5. 50
  6. 160
  7. Straight
  8. 140
  9. Acute
  10. 55
  11. Right
  12. 100
  13. 145
  14. 30
  15. 120
  16. Obtuse
  17. 10
  18. 45
  19. 150
  20. 115
  21. 65
  22. 70
  23. 60
  24. Obtuse
  25. 25
  26. 100
  27. 95
  28. 180
  29. 70
  30. 80
  31. 160
  32. 50
  33. 140
  34. 150
  35. 45
  36. 60
  37. 105
  38. 55
  39. 90
  40. 85

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