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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 67 · 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 85°. What is the third angle (in degrees)?
  2. 2.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  3. 3.What is the smaller angle between the hands of a clock at 4 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 together make a straight line. One of them is 170°. What is the other angle (in degrees)?
  6. 6.Two angles together make a straight line. One of them is 155°. What is the other angle (in degrees)?
  7. 7.Two angles of a triangle are 85° and 70°. What is the third angle (in degrees)?
  8. 8.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  9. 9.An angle measures 60°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  10. 10.Two angles together make a straight line. One of them is 90°. What is the other angle (in degrees)?
  11. 11.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  12. 12.An angle measures 85°. What kind of angle is it? (a) Right (b) Straight (c) Acute
  13. 13.Two angles of a triangle are 40° and 90°. What is the third angle (in degrees)?
  14. 14.Three angles meet at a point. Two of them are 60° and 90°. What is the third angle (in degrees)?
  15. 15.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  16. 16.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  17. 17.Three angles meet at a point. Two of them are 120° and 160°. What is the third angle (in degrees)?
  18. 18.An angle measures 110°. What kind of angle is it? (a) Straight (b) Obtuse (c) Right
  19. 19.Two angles of a triangle are 90° and 45°. What is the third angle (in degrees)?
  20. 20.Two angles of a triangle are 75° and 45°. What is the third angle (in degrees)?
  21. 21.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  22. 22.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  23. 23.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  24. 24.Two angles of a triangle are 30° and 120°. What is the third angle (in degrees)?
  25. 25.Two angles of a triangle are 45° and 100°. What is the third angle (in degrees)?
  26. 26.An angle measures 105°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  27. 27.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  28. 28.Two angles together make a straight line. One of them is 165°. What is the other angle (in degrees)?
  29. 29.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  30. 30.A right angle is split into two angles. One of them is 75°. What is the other angle (in degrees)?
  31. 31.Two angles together make a straight line. One of them is 120°. What is the other angle (in degrees)?
  32. 32.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  33. 33.Two angles together make a straight line. One of them is 70°. What is the other angle (in degrees)?
  34. 34.Two angles of a triangle are 100° and 20°. What is the third angle (in degrees)?
  35. 35.Two angles of a triangle are 50° and 20°. What is the third angle (in degrees)?
  36. 36.Two angles together make a straight line. One of them is 125°. What is the other angle (in degrees)?
  37. 37.An angle measures 55°. What kind of angle is it? (a) Right (b) Straight (c) Acute
  38. 38.An angle measures 90°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  39. 39.Two angles together make a straight line. One of them is 55°. What is the other angle (in degrees)?
  40. 40.Two angles of a triangle are 85° and 80°. What is the third angle (in degrees)?

Answer key

  1. 75
  2. 150
  3. 120
  4. 150
  5. 10
  6. 25
  7. 25
  8. 90
  9. Acute
  10. 90
  11. 25
  12. Acute
  13. 50
  14. 210
  15. 180
  16. 70
  17. 80
  18. Obtuse
  19. 45
  20. 60
  21. 80
  22. 90
  23. 30
  24. 30
  25. 35
  26. Obtuse
  27. 30
  28. 15
  29. 55
  30. 15
  31. 60
  32. 60
  33. 110
  34. 60
  35. 110
  36. 55
  37. Acute
  38. Right
  39. 125
  40. 15

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