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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 178 · 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 35° and 65°. What is the third angle (in degrees)?
  2. 2.Three angles meet at a point. Two of them are 70° and 180°. What is the third angle (in degrees)?
  3. 3.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  4. 4.Two angles together make a straight line. One of them is 155°. What is the other angle (in degrees)?
  5. 5.An angle measures 10°. What kind of angle is it? (a) Straight (b) Right (c) Acute
  6. 6.An angle measures 25°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  7. 7.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  8. 8.Two angles together make a straight line. One of them is 90°. What is the other angle (in degrees)?
  9. 9.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  10. 10.Three angles meet at a point. Two of them are 80° and 180°. What is the third angle (in degrees)?
  11. 11.Two angles of a triangle are 55° and 120°. What is the third angle (in degrees)?
  12. 12.Three angles meet at a point. Two of them are 130° and 80°. What is the third angle (in degrees)?
  13. 13.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  14. 14.An angle measures 180°. What kind of angle is it? (a) Obtuse (b) Right (c) Straight
  15. 15.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  16. 16.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  17. 17.Two angles of a triangle are 25° and 40°. What is the third angle (in degrees)?
  18. 18.A right angle is split into two angles. One of them is 45°. What is the other angle (in degrees)?
  19. 19.Two angles of a triangle are 20° and 65°. What is the third angle (in degrees)?
  20. 20.Two angles together make a straight line. One of them is 45°. What is the other angle (in degrees)?
  21. 21.Three angles meet at a point. Two of them are 140° and 80°. What is the third angle (in degrees)?
  22. 22.Two angles together make a straight line. One of them is 150°. What is the other angle (in degrees)?
  23. 23.An angle measures 15°. What kind of angle is it? (a) Right (b) Acute (c) Obtuse
  24. 24.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?
  25. 25.Two angles together make a straight line. One of them is 60°. What is the other angle (in degrees)?
  26. 26.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  27. 27.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  28. 28.Two angles together make a straight line. One of them is 120°. What is the other angle (in degrees)?
  29. 29.Two angles together make a straight line. One of them is 115°. What is the other angle (in degrees)?
  30. 30.A right angle is split into two angles. One of them is 30°. What is the other angle (in degrees)?
  31. 31.An angle measures 80°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  32. 32.Two angles of a triangle are 60° and 20°. What is the third angle (in degrees)?
  33. 33.Two angles of a triangle are 70° and 95°. What is the third angle (in degrees)?
  34. 34.Two angles of a triangle are 55° and 40°. What is the third angle (in degrees)?
  35. 35.Two angles of a triangle are 25° and 55°. What is the third angle (in degrees)?
  36. 36.Two angles of a triangle are 85° and 35°. What is the third angle (in degrees)?
  37. 37.Two angles of a triangle are 70° and 30°. What is the third angle (in degrees)?
  38. 38.Two angles of a triangle are 40° and 25°. What is the third angle (in degrees)?
  39. 39.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  40. 40.Three angles meet at a point. Two of them are 70° and 60°. What is the third angle (in degrees)?

Answer key

  1. 80
  2. 110
  3. 150
  4. 25
  5. Acute
  6. Acute
  7. 10
  8. 90
  9. 65
  10. 100
  11. 5
  12. 150
  13. 30
  14. Straight
  15. 50
  16. 150
  17. 115
  18. 45
  19. 95
  20. 135
  21. 140
  22. 30
  23. Acute
  24. 40
  25. 120
  26. 90
  27. 5
  28. 60
  29. 65
  30. 60
  31. Acute
  32. 100
  33. 15
  34. 85
  35. 100
  36. 60
  37. 80
  38. 115
  39. 25
  40. 230

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