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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 114 · 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 100° and 30°. What is the third angle (in degrees)?
  2. 2.Three angles meet at a point. Two of them are 60° and 140°. What is the third angle (in degrees)?
  3. 3.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  4. 4.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  5. 5.Two angles of a triangle are 100° and 25°. What is the third angle (in degrees)?
  6. 6.Three angles meet at a point. Two of them are 50° and 110°. What is the third angle (in degrees)?
  7. 7.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  8. 8.Three angles meet at a point. Two of them are 80° and 50°. What is the third angle (in degrees)?
  9. 9.Three angles meet at a point. Two of them are 70° and 50°. What is the third angle (in degrees)?
  10. 10.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  11. 11.Two angles together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  12. 12.Two angles together make a straight line. One of them is 75°. What is the other angle (in degrees)?
  13. 13.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  14. 14.An angle measures 180°. What kind of angle is it? (a) Right (b) Acute (c) Straight
  15. 15.Two angles together make a straight line. One of them is 50°. What is the other angle (in degrees)?
  16. 16.An angle measures 45°. What kind of angle is it? (a) Straight (b) Acute (c) Right
  17. 17.An angle measures 50°. What kind of angle is it? (a) Obtuse (b) Acute (c) Straight
  18. 18.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  19. 19.Three angles meet at a point. Two of them are 100° and 70°. What is the third angle (in degrees)?
  20. 20.Two angles of a triangle are 20° and 85°. What is the third angle (in degrees)?
  21. 21.An angle measures 10°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  22. 22.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  23. 23.Two angles of a triangle are 55° and 90°. What is the third angle (in degrees)?
  24. 24.Two angles of a triangle are 60° and 40°. What is the third angle (in degrees)?
  25. 25.Two angles of a triangle are 20° and 30°. What is the third angle (in degrees)?
  26. 26.What is the smaller angle between the hands of a clock at 8 o'clock (in degrees)?
  27. 27.Two angles together make a straight line. One of them is 15°. What is the other angle (in degrees)?
  28. 28.Three angles meet at a point. Two of them are 140° and 90°. What is the third angle (in degrees)?
  29. 29.Two angles together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  30. 30.An angle measures 90°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  31. 31.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  32. 32.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  33. 33.An angle measures 155°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  34. 34.Two angles together make a straight line. One of them is 165°. What is the other angle (in degrees)?
  35. 35.Two angles of a triangle are 30° and 70°. What is the third angle (in degrees)?
  36. 36.Two angles of a triangle are 30° and 30°. What is the third angle (in degrees)?
  37. 37.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  38. 38.Two angles of a triangle are 20° and 135°. What is the third 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.Three angles meet at a point. Two of them are 100° and 170°. What is the third angle (in degrees)?

Answer key

  1. 50
  2. 160
  3. 90
  4. 150
  5. 55
  6. 200
  7. 60
  8. 230
  9. 240
  10. 10
  11. 160
  12. 105
  13. 70
  14. Straight
  15. 130
  16. Acute
  17. Acute
  18. 60
  19. 190
  20. 75
  21. Acute
  22. 65
  23. 35
  24. 80
  25. 130
  26. 120
  27. 165
  28. 130
  29. 170
  30. Right
  31. 80
  32. 5
  33. Obtuse
  34. 15
  35. 80
  36. 120
  37. 85
  38. 25
  39. 25
  40. 90

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