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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 901 · 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 50° and 120°. What is the third angle (in degrees)?
  2. 2.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 105°. What is the other angle (in degrees)?
  4. 4.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  5. 5.Two angles together make a straight line. One of them is 160°. What is the other angle (in degrees)?
  6. 6.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?
  7. 7.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  8. 8.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  9. 9.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  10. 10.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  11. 11.Two angles together make a straight line. One of them is 155°. What is the other angle (in degrees)?
  12. 12.An angle measures 90°. What kind of angle is it? (a) Straight (b) Right (c) Acute
  13. 13.Two angles together make a straight line. One of them is 50°. What is the other angle (in degrees)?
  14. 14.Two angles of a triangle are 65° and 90°. What is the third angle (in degrees)?
  15. 15.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  16. 16.Three angles meet at a point. Two of them are 50° and 110°. What is the third angle (in degrees)?
  17. 17.An angle measures 110°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  18. 18.Three angles meet at a point. Two of them are 150° and 50°. What is the third angle (in degrees)?
  19. 19.Three angles meet at a point. Two of them are 60° and 150°. What is the third angle (in degrees)?
  20. 20.Two angles together make a straight line. One of them is 75°. What is the other angle (in degrees)?
  21. 21.Two angles together make a straight line. One of them is 80°. What is the other angle (in degrees)?
  22. 22.Two angles together make a straight line. One of them is 25°. What is the other angle (in degrees)?
  23. 23.Two angles together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  24. 24.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  25. 25.Two angles together make a straight line. One of them is 35°. What is the other angle (in degrees)?
  26. 26.Three angles meet at a point. Two of them are 60° and 170°. What is the third angle (in degrees)?
  27. 27.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  28. 28.Two angles together make a straight line. One of them is 115°. What is the other angle (in degrees)?
  29. 29.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  30. 30.An angle measures 160°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  31. 31.Two angles of a triangle are 85° and 65°. What is the third angle (in degrees)?
  32. 32.An angle measures 70°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  33. 33.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  34. 34.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  35. 35.An angle measures 150°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  36. 36.Three angles meet at a point. Two of them are 100° and 190°. What is the third angle (in degrees)?
  37. 37.Two angles of a triangle are 70° and 75°. What is the third angle (in degrees)?
  38. 38.Two angles of a triangle are 40° and 60°. What is the third angle (in degrees)?
  39. 39.What is the smaller angle between the hands of a clock at 8 o'clock (in degrees)?
  40. 40.Two angles of a triangle are 85° and 80°. What is the third angle (in degrees)?

Answer key

  1. 10
  2. 60
  3. 75
  4. 75
  5. 20
  6. 85
  7. 90
  8. 80
  9. 150
  10. 150
  11. 25
  12. Right
  13. 130
  14. 25
  15. 55
  16. 200
  17. Obtuse
  18. 160
  19. 150
  20. 105
  21. 100
  22. 155
  23. 170
  24. 90
  25. 145
  26. 130
  27. 150
  28. 65
  29. 10
  30. Obtuse
  31. 30
  32. Acute
  33. 85
  34. 80
  35. Obtuse
  36. 70
  37. 35
  38. 80
  39. 120
  40. 15

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