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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 38 · 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.Three angles meet at a point. Two of them are 140° and 110°. What is the third angle (in degrees)?
  2. 2.Two angles of a triangle are 75° and 25°. What is the third angle (in degrees)?
  3. 3.Two angles of a triangle are 100° and 45°. What is the third angle (in degrees)?
  4. 4.Three angles meet at a point. Two of them are 100° and 50°. What is the third angle (in degrees)?
  5. 5.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  6. 6.Two angles together make a straight line. One of them is 115°. What is the other angle (in degrees)?
  7. 7.Two angles of a triangle are 20° and 125°. What is the third angle (in degrees)?
  8. 8.Two angles of a triangle are 90° and 20°. What is the third angle (in degrees)?
  9. 9.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  10. 10.An angle measures 180°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse
  11. 11.Two angles together make a straight line. One of them is 130°. What is the other angle (in degrees)?
  12. 12.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  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 together make a straight line. One of them is 90°. What is the other angle (in degrees)?
  15. 15.Three angles meet at a point. Two of them are 110° and 140°. What is the third angle (in degrees)?
  16. 16.Two angles together make a straight line. One of them is 165°. What is the other angle (in degrees)?
  17. 17.Two angles of a triangle are 65° and 105°. What is the third angle (in degrees)?
  18. 18.An angle measures 105°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  19. 19.Two angles together make a straight line. One of them is 120°. What is the other angle (in degrees)?
  20. 20.Two angles together make a straight line. One of them is 110°. What is the other angle (in degrees)?
  21. 21.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  22. 22.Three angles meet at a point. Two of them are 110° and 50°. What is the third angle (in degrees)?
  23. 23.Three angles meet at a point. Two of them are 60° and 120°. What is the third angle (in degrees)?
  24. 24.An angle measures 90°. What kind of angle is it? (a) Right (b) Acute (c) Straight
  25. 25.Two angles together make a straight line. One of them is 160°. What is the other angle (in degrees)?
  26. 26.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  27. 27.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  28. 28.Two angles together make a straight line. One of them is 125°. What is the other angle (in degrees)?
  29. 29.Two angles together make a straight line. One of them is 50°. What is the other angle (in degrees)?
  30. 30.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  31. 31.Two angles of a triangle are 65° and 90°. What is the third angle (in degrees)?
  32. 32.Three angles meet at a point. Two of them are 140° and 100°. What is the third angle (in degrees)?
  33. 33.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  34. 34.Two angles together make a straight line. One of them is 35°. What is the other angle (in degrees)?
  35. 35.An angle measures 95°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  36. 36.Two angles of a triangle are 75° and 90°. What is the third angle (in degrees)?
  37. 37.Two angles of a triangle are 40° and 75°. What is the third angle (in degrees)?
  38. 38.An angle measures 170°. What kind of angle is it? (a) Obtuse (b) Acute (c) Straight
  39. 39.Two angles together make a straight line. One of them is 105°. What is the other angle (in degrees)?
  40. 40.Three angles meet at a point. Two of them are 50° and 230°. What is the third angle (in degrees)?

Answer key

  1. 110
  2. 80
  3. 35
  4. 210
  5. 80
  6. 65
  7. 35
  8. 70
  9. 85
  10. Straight
  11. 50
  12. 75
  13. 85
  14. 90
  15. 110
  16. 15
  17. 10
  18. Obtuse
  19. 60
  20. 70
  21. 60
  22. 200
  23. 180
  24. Right
  25. 20
  26. 120
  27. 180
  28. 55
  29. 130
  30. 30
  31. 25
  32. 120
  33. 150
  34. 145
  35. Obtuse
  36. 15
  37. 65
  38. Obtuse
  39. 75
  40. 80

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