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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 612 · 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 90° and 40°. What is the third angle (in degrees)?
  2. 2.Two angles together make a straight line. One of them is 110°. What is the other angle (in degrees)?
  3. 3.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  4. 4.Two angles together make a straight line. One of them is 130°. What is the other angle (in degrees)?
  5. 5.An angle measures 180°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  6. 6.Three angles meet at a point. Two of them are 150° and 60°. What is the third angle (in degrees)?
  7. 7.An angle measures 75°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  8. 8.What is the smaller angle between the hands of a clock at 10 o'clock (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 of a triangle are 80° and 35°. What is the third angle (in degrees)?
  11. 11.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  12. 12.Two angles of a triangle are 95° and 20°. What is the third angle (in degrees)?
  13. 13.Two angles together make a straight line. One of them is 70°. What is the other angle (in degrees)?
  14. 14.An angle measures 90°. What kind of angle is it? (a) Right (b) Straight (c) Obtuse
  15. 15.Three angles meet at a point. Two of them are 150° and 50°. What is the third angle (in degrees)?
  16. 16.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  17. 17.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  18. 18.Two angles of a triangle are 25° and 85°. What is the third angle (in degrees)?
  19. 19.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  20. 20.An angle measures 135°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  21. 21.Three angles meet at a point. Two of them are 130° and 70°. What is the third angle (in degrees)?
  22. 22.Three angles meet at a point. Two of them are 60° and 180°. What is the third angle (in degrees)?
  23. 23.What is the smaller angle between the hands of a clock at 8 o'clock (in degrees)?
  24. 24.A right angle is split into two angles. One of them is 60°. What is the other angle (in degrees)?
  25. 25.Two angles of a triangle are 100° and 30°. What is the third angle (in degrees)?
  26. 26.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  27. 27.Three angles meet at a point. Two of them are 70° and 80°. What is the third angle (in degrees)?
  28. 28.An angle measures 15°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  29. 29.Three angles meet at a point. Two of them are 80° and 110°. What is the third angle (in degrees)?
  30. 30.Two angles of a triangle are 20° and 45°. What is the third angle (in degrees)?
  31. 31.Three angles meet at a point. Two of them are 80° and 210°. What is the third angle (in degrees)?
  32. 32.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  33. 33.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  34. 34.Two angles of a triangle are 90° and 25°. What is the third angle (in degrees)?
  35. 35.An angle measures 175°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  36. 36.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  37. 37.Two angles of a triangle are 85° and 20°. What is the third angle (in degrees)?
  38. 38.Two angles together make a straight line. One of them is 25°. What is the other angle (in degrees)?
  39. 39.Three angles meet at a point. Two of them are 50° and 110°. What is the third angle (in degrees)?
  40. 40.Two angles of a triangle are 40° and 120°. What is the third angle (in degrees)?

Answer key

  1. 50
  2. 70
  3. 80
  4. 50
  5. Straight
  6. 150
  7. Acute
  8. 60
  9. 45
  10. 65
  11. 10
  12. 65
  13. 110
  14. Right
  15. 160
  16. 60
  17. 25
  18. 70
  19. 70
  20. Obtuse
  21. 160
  22. 120
  23. 120
  24. 30
  25. 50
  26. 85
  27. 210
  28. Acute
  29. 170
  30. 115
  31. 70
  32. 180
  33. 55
  34. 65
  35. Obtuse
  36. 50
  37. 75
  38. 155
  39. 200
  40. 20

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