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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 53 · 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 90°. What is the third angle (in degrees)?
  2. 2.Two angles together make a straight line. One of them is 105°. What is the other angle (in degrees)?
  3. 3.A right angle is split into two angles. One of them is 60°. What is the other angle (in degrees)?
  4. 4.Three angles meet at a point. Two of them are 70° and 110°. What is the third angle (in degrees)?
  5. 5.Two angles together make a straight line. One of them is 75°. What is the other angle (in degrees)?
  6. 6.An angle measures 105°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  7. 7.An angle measures 175°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  8. 8.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  9. 9.Three angles meet at a point. Two of them are 140° and 80°. What is the third angle (in degrees)?
  10. 10.An angle measures 60°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  11. 11.Two angles of a triangle are 75° and 60°. What is the third angle (in degrees)?
  12. 12.An angle measures 140°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  13. 13.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?
  14. 14.Two angles of a triangle are 85° and 65°. What is the third angle (in degrees)?
  15. 15.An angle measures 90°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  16. 16.An angle measures 180°. What kind of angle is it? (a) Straight (b) Right (c) Acute
  17. 17.Three angles meet at a point. Two of them are 150° and 50°. What is the third angle (in degrees)?
  18. 18.Two angles together make a straight line. One of them is 35°. What is the other angle (in degrees)?
  19. 19.What is the smaller angle between the hands of a clock at 8 o'clock (in degrees)?
  20. 20.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  21. 21.Two angles together make a straight line. One of them is 135°. What is the other angle (in degrees)?
  22. 22.Two angles together make a straight line. One of them is 45°. What is the other angle (in degrees)?
  23. 23.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  24. 24.Two angles together make a straight line. One of them is 25°. What is the other angle (in degrees)?
  25. 25.An angle measures 145°. What kind of angle is it? (a) Right (b) Obtuse (c) Straight
  26. 26.Two angles of a triangle are 30° and 95°. What is the third angle (in degrees)?
  27. 27.Two angles of a triangle are 35° and 120°. What is the third angle (in degrees)?
  28. 28.What is the smaller angle between the hands of a clock at 7 o'clock (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.Three angles meet at a point. Two of them are 90° and 160°. What is the third angle (in degrees)?
  31. 31.Three angles meet at a point. Two of them are 60° and 220°. What is the third angle (in degrees)?
  32. 32.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  33. 33.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  34. 34.Two angles of a triangle are 100° and 40°. What is the third angle (in degrees)?
  35. 35.Two angles together make a straight line. One of them is 80°. What is the other angle (in degrees)?
  36. 36.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  37. 37.An angle measures 170°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  38. 38.Three angles meet at a point. Two of them are 130° and 170°. What is the third angle (in degrees)?
  39. 39.Three angles meet at a point. Two of them are 70° and 100°. What is the third angle (in degrees)?
  40. 40.Three angles meet at a point. Two of them are 60° and 80°. What is the third angle (in degrees)?

Answer key

  1. 10
  2. 75
  3. 30
  4. 180
  5. 105
  6. Obtuse
  7. Obtuse
  8. 65
  9. 140
  10. Acute
  11. 45
  12. Obtuse
  13. 85
  14. 30
  15. Right
  16. Straight
  17. 160
  18. 145
  19. 120
  20. 60
  21. 45
  22. 135
  23. 25
  24. 155
  25. Obtuse
  26. 55
  27. 25
  28. 150
  29. 45
  30. 110
  31. 80
  32. 50
  33. 120
  34. 40
  35. 100
  36. 90
  37. Obtuse
  38. 60
  39. 190
  40. 220

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