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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 79 · 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 together make a straight line. One of them is 115°. What is the other angle (in degrees)?
  2. 2.Two angles of a triangle are 40° and 75°. What is the third angle (in degrees)?
  3. 3.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  4. 4.Two angles together make a straight line. One of them is 110°. What is the other angle (in degrees)?
  5. 5.Two angles of a triangle are 25° and 125°. What is the third angle (in degrees)?
  6. 6.An angle measures 20°. What kind of angle is it? (a) Acute (b) Straight (c) Right
  7. 7.Two angles together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  8. 8.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  9. 9.Two angles of a triangle are 80° and 85°. What is the third angle (in degrees)?
  10. 10.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  11. 11.Three angles meet at a point. Two of them are 50° and 210°. What is the third angle (in degrees)?
  12. 12.Two angles together make a straight line. One of them is 25°. 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.Three angles meet at a point. Two of them are 120° and 100°. What is the third angle (in degrees)?
  15. 15.A right angle is split into two angles. One of them is 60°. What is the other angle (in degrees)?
  16. 16.An angle measures 105°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  17. 17.Three angles meet at a point. Two of them are 120° and 80°. What is the third angle (in degrees)?
  18. 18.An angle measures 130°. What kind of angle is it? (a) Obtuse (b) Straight (c) Right
  19. 19.An angle measures 30°. What kind of angle is it? (a) Acute (b) Right (c) Straight
  20. 20.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  21. 21.Two angles of a triangle are 65° and 35°. What is the third angle (in degrees)?
  22. 22.Two angles together make a straight line. One of them is 170°. What is the other angle (in degrees)?
  23. 23.Two angles together make a straight line. One of them is 150°. What is the other angle (in degrees)?
  24. 24.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?
  25. 25.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  26. 26.Two angles together make a straight line. One of them is 75°. What is the other angle (in degrees)?
  27. 27.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  28. 28.Two angles of a triangle are 70° and 90°. What is the third angle (in degrees)?
  29. 29.Two angles of a triangle are 65° and 25°. What is the third angle (in degrees)?
  30. 30.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  31. 31.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  32. 32.Two angles together make a straight line. One of them is 60°. What is the other angle (in degrees)?
  33. 33.Two angles of a triangle are 45° and 30°. What is the third angle (in degrees)?
  34. 34.Three angles meet at a point. Two of them are 110° and 170°. What is the third angle (in degrees)?
  35. 35.An angle measures 95°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  36. 36.Three angles meet at a point. Two of them are 80° and 200°. What is the third angle (in degrees)?
  37. 37.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  38. 38.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  39. 39.An angle measures 90°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  40. 40.Three angles meet at a point. Two of them are 140° and 130°. What is the third angle (in degrees)?

Answer key

  1. 65
  2. 65
  3. 30
  4. 70
  5. 30
  6. Acute
  7. 160
  8. 80
  9. 15
  10. 140
  11. 100
  12. 155
  13. 70
  14. 140
  15. 30
  16. Obtuse
  17. 160
  18. Obtuse
  19. Acute
  20. 60
  21. 80
  22. 10
  23. 30
  24. 40
  25. 60
  26. 105
  27. 50
  28. 20
  29. 90
  30. 90
  31. 150
  32. 120
  33. 105
  34. 80
  35. Obtuse
  36. 80
  37. 35
  38. 5
  39. Right
  40. 90

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