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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 122 · 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 60° and 65°. What is the third angle (in degrees)?
  2. 2.Two angles together make a straight line. One of them is 75°. What is the other angle (in degrees)?
  3. 3.A right angle is split into two angles. One of them is 75°. What is the other angle (in degrees)?
  4. 4.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  5. 5.A right angle is split into two angles. One of them is 60°. What is the other angle (in degrees)?
  6. 6.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  7. 7.Three angles meet at a point. Two of them are 90° and 100°. What is the third angle (in degrees)?
  8. 8.Two angles of a triangle are 35° and 20°. What is the third angle (in degrees)?
  9. 9.A right angle is split into two angles. One of them is 45°. What is the other angle (in degrees)?
  10. 10.Two angles together make a straight line. One of them is 105°. What is the other angle (in degrees)?
  11. 11.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  12. 12.An angle measures 75°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse
  13. 13.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  14. 14.Two angles of a triangle are 20° and 80°. What is the third angle (in degrees)?
  15. 15.Three angles meet at a point. Two of them are 70° and 80°. What is the third angle (in degrees)?
  16. 16.Two angles together make a straight line. One of them is 35°. What is the other angle (in degrees)?
  17. 17.Two angles of a triangle are 80° and 25°. What is the third angle (in degrees)?
  18. 18.Two angles together make a straight line. One of them is 155°. What is the other angle (in degrees)?
  19. 19.An angle measures 15°. What kind of angle is it? (a) Straight (b) Right (c) Acute
  20. 20.Three angles meet at a point. Two of them are 150° and 50°. What is the third angle (in degrees)?
  21. 21.An angle measures 40°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  22. 22.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  23. 23.Two angles of a triangle are 30° and 95°. What is the third angle (in degrees)?
  24. 24.Two angles of a triangle are 85° and 65°. What is the third angle (in degrees)?
  25. 25.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  26. 26.An angle measures 160°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  27. 27.Two angles together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  28. 28.Three angles meet at a point. Two of them are 140° and 130°. What is the third angle (in degrees)?
  29. 29.Two angles of a triangle are 30° and 120°. What is the third angle (in degrees)?
  30. 30.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?
  31. 31.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  32. 32.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  33. 33.A right angle is split into two angles. One of them is 70°. What is the other angle (in degrees)?
  34. 34.An angle measures 30°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  35. 35.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  36. 36.Three angles meet at a point. Two of them are 60° and 170°. What is the third angle (in degrees)?
  37. 37.An angle measures 90°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  38. 38.Two angles of a triangle are 50° and 120°. What is the third angle (in degrees)?
  39. 39.Two angles together make a straight line. One of them is 170°. What is the other angle (in degrees)?
  40. 40.An angle measures 55°. What kind of angle is it? (a) Right (b) Straight (c) Acute

Answer key

  1. 55
  2. 105
  3. 15
  4. 120
  5. 30
  6. 90
  7. 170
  8. 125
  9. 45
  10. 75
  11. 140
  12. Acute
  13. 55
  14. 80
  15. 210
  16. 145
  17. 75
  18. 25
  19. Acute
  20. 160
  21. Acute
  22. 25
  23. 55
  24. 30
  25. 50
  26. Obtuse
  27. 170
  28. 90
  29. 30
  30. 85
  31. 75
  32. 65
  33. 20
  34. Acute
  35. 150
  36. 130
  37. Right
  38. 10
  39. 10
  40. Acute

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