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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 89 · 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 20° and 75°. What is the third angle (in degrees)?
  2. 2.Two angles of a triangle are 55° and 65°. What is the third angle (in degrees)?
  3. 3.Three angles meet at a point. Two of them are 90° and 160°. What is the third angle (in degrees)?
  4. 4.Two angles together make a straight line. One of them is 150°. What is the other angle (in degrees)?
  5. 5.Two angles of a triangle are 75° and 25°. What is the third angle (in degrees)?
  6. 6.Two angles of a triangle are 30° and 145°. What is the third angle (in degrees)?
  7. 7.Three angles meet at a point. Two of them are 70° and 70°. What is the third angle (in degrees)?
  8. 8.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  9. 9.Three angles meet at a point. Two of them are 90° and 60°. What is the third angle (in degrees)?
  10. 10.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  11. 11.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  12. 12.Two angles together make a straight line. One of them is 65°. What is the other angle (in degrees)?
  13. 13.An angle measures 90°. What kind of angle is it? (a) Right (b) Straight (c) Obtuse
  14. 14.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  15. 15.An angle measures 180°. What kind of angle is it? (a) Straight (b) Acute (c) Right
  16. 16.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  17. 17.Three angles meet at a point. Two of them are 50° and 170°. What is the third angle (in degrees)?
  18. 18.Three angles meet at a point. Two of them are 90° and 100°. What is the third angle (in degrees)?
  19. 19.Three angles meet at a point. Two of them are 60° and 50°. What is the third angle (in degrees)?
  20. 20.Three angles meet at a point. Two of them are 130° and 120°. What is the third angle (in degrees)?
  21. 21.An angle measures 15°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  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 75°. What is the other angle (in degrees)?
  24. 24.Two angles of a triangle are 45° and 70°. What is the third angle (in degrees)?
  25. 25.Two angles of a triangle are 60° and 85°. What is the third angle (in degrees)?
  26. 26.Two angles together make a straight line. One of them is 60°. What is the other angle (in degrees)?
  27. 27.Two angles of a triangle are 90° and 20°. What is the third angle (in degrees)?
  28. 28.Two angles of a triangle are 55° and 105°. What is the third angle (in degrees)?
  29. 29.Two angles together make a straight line. One of them is 25°. What is the other angle (in degrees)?
  30. 30.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  31. 31.Two angles together make a straight line. One of them is 85°. What is the other angle (in degrees)?
  32. 32.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  33. 33.Two angles of a triangle are 40° and 50°. What is the third angle (in degrees)?
  34. 34.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  35. 35.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  36. 36.Two angles of a triangle are 25° and 150°. What is the third angle (in degrees)?
  37. 37.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  38. 38.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  39. 39.Three angles meet at a point. Two of them are 150° and 140°. What is the third angle (in degrees)?
  40. 40.Two angles together make a straight line. One of them is 165°. What is the other angle (in degrees)?

Answer key

  1. 85
  2. 60
  3. 110
  4. 30
  5. 80
  6. 5
  7. 220
  8. 180
  9. 210
  10. 120
  11. 65
  12. 115
  13. Right
  14. 150
  15. Straight
  16. 75
  17. 140
  18. 170
  19. 250
  20. 110
  21. Acute
  22. 135
  23. 15
  24. 65
  25. 35
  26. 120
  27. 70
  28. 20
  29. 155
  30. 85
  31. 95
  32. 70
  33. 90
  34. 60
  35. 80
  36. 5
  37. 80
  38. 50
  39. 70
  40. 15

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