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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 91 · 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 80° and 75°. What is the third angle (in degrees)?
  2. 2.Two angles of a triangle are 45° and 110°. What is the third angle (in degrees)?
  3. 3.An angle measures 175°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse
  4. 4.Two angles of a triangle are 45° and 20°. What is the third angle (in degrees)?
  5. 5.What is the smaller angle between the hands of a clock at 8 o'clock (in degrees)?
  6. 6.An angle measures 90°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  7. 7.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  8. 8.A right angle is split into two angles. One of them is 30°. What is the other angle (in degrees)?
  9. 9.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  10. 10.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  11. 11.An angle measures 180°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  12. 12.Two angles together make a straight line. One of them is 160°. What is the other angle (in degrees)?
  13. 13.Two angles together make a straight line. One of them is 165°. What is the other angle (in degrees)?
  14. 14.Two angles of a triangle are 20° and 135°. What is the third angle (in degrees)?
  15. 15.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  16. 16.Two angles together make a straight line. One of them is 50°. What is the other angle (in degrees)?
  17. 17.Three angles meet at a point. Two of them are 60° and 120°. What is the third angle (in degrees)?
  18. 18.Two angles of a triangle are 35° and 120°. What is the third angle (in degrees)?
  19. 19.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  20. 20.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  21. 21.Three angles meet at a point. Two of them are 120° and 110°. What is the third angle (in degrees)?
  22. 22.Two angles of a triangle are 70° and 90°. What is the third angle (in degrees)?
  23. 23.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  24. 24.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  25. 25.Two angles of a triangle are 85° and 60°. What is the third angle (in degrees)?
  26. 26.Three angles meet at a point. Two of them are 70° and 50°. What is the third angle (in degrees)?
  27. 27.Three angles meet at a point. Two of them are 100° and 70°. What is the third angle (in degrees)?
  28. 28.Three angles meet at a point. Two of them are 120° and 50°. What is the third angle (in degrees)?
  29. 29.A right angle is split into two angles. One of them is 45°. What is the other angle (in degrees)?
  30. 30.Two angles together make a straight line. One of them is 85°. What is the other angle (in degrees)?
  31. 31.An angle measures 155°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  32. 32.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  33. 33.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  34. 34.A right angle is split into two angles. One of them is 60°. What is the other angle (in degrees)?
  35. 35.Two angles of a triangle are 25° and 20°. What is the third angle (in degrees)?
  36. 36.Two angles together make a straight line. One of them is 90°. What is the other angle (in degrees)?
  37. 37.Two angles together make a straight line. One of them is 75°. What is the other angle (in degrees)?
  38. 38.Two angles together make a straight line. One of them is 105°. What is the other angle (in degrees)?
  39. 39.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  40. 40.An angle measures 140°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse

Answer key

  1. 25
  2. 25
  3. Obtuse
  4. 115
  5. 120
  6. Right
  7. 140
  8. 60
  9. 80
  10. 90
  11. Straight
  12. 20
  13. 15
  14. 25
  15. 80
  16. 130
  17. 180
  18. 25
  19. 55
  20. 150
  21. 130
  22. 20
  23. 60
  24. 120
  25. 35
  26. 240
  27. 190
  28. 190
  29. 45
  30. 95
  31. Obtuse
  32. 65
  33. 150
  34. 30
  35. 135
  36. 90
  37. 105
  38. 75
  39. 25
  40. Obtuse

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