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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 621 · 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.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  2. 2.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  3. 3.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  4. 4.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  5. 5.Two angles together make a straight line. One of them is 70°. What is the other angle (in degrees)?
  6. 6.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  7. 7.Two angles of a triangle are 35° and 120°. What is the third angle (in degrees)?
  8. 8.A right angle is split into two angles. One of them is 30°. What is the other angle (in degrees)?
  9. 9.An angle measures 75°. What kind of angle is it? (a) Acute (b) Straight (c) Right
  10. 10.Two angles together make a straight line. One of them is 105°. What is the other angle (in degrees)?
  11. 11.Two angles of a triangle are 95° and 35°. What is the third angle (in degrees)?
  12. 12.Three angles meet at a point. Two of them are 70° and 70°. What is the third angle (in degrees)?
  13. 13.Two angles of a triangle are 40° and 130°. What is the third angle (in degrees)?
  14. 14.An angle measures 80°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  15. 15.Two angles together make a straight line. One of them is 80°. What is the other angle (in degrees)?
  16. 16.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  17. 17.An angle measures 180°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  18. 18.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  19. 19.Two angles of a triangle are 100° and 55°. 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.Two angles together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  22. 22.An angle measures 90°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  23. 23.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  24. 24.Two angles together make a straight line. One of them is 15°. What is the other angle (in degrees)?
  25. 25.Two angles of a triangle are 25° and 125°. What is the third angle (in degrees)?
  26. 26.Two angles together make a straight line. One of them is 115°. What is the other angle (in degrees)?
  27. 27.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  28. 28.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  29. 29.Two angles of a triangle are 25° and 65°. What is the third angle (in degrees)?
  30. 30.Three angles meet at a point. Two of them are 140° and 50°. What is the third angle (in degrees)?
  31. 31.Two angles of a triangle are 90° and 55°. What is the third angle (in degrees)?
  32. 32.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  33. 33.Two angles of a triangle are 25° and 120°. What is the third angle (in degrees)?
  34. 34.Three angles meet at a point. Two of them are 130° and 110°. What is the third angle (in degrees)?
  35. 35.An angle measures 165°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  36. 36.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  37. 37.Three angles meet at a point. Two of them are 80° and 120°. What is the third angle (in degrees)?
  38. 38.An angle measures 85°. What kind of angle is it? (a) Obtuse (b) Straight (c) Acute
  39. 39.Two angles of a triangle are 25° and 80°. What is the third angle (in degrees)?
  40. 40.Two angles together make a straight line. One of them is 125°. What is the other angle (in degrees)?

Answer key

  1. 70
  2. 10
  3. 50
  4. 30
  5. 110
  6. 180
  7. 25
  8. 60
  9. Acute
  10. 75
  11. 50
  12. 220
  13. 10
  14. Acute
  15. 100
  16. 80
  17. Straight
  18. 60
  19. 25
  20. 135
  21. 160
  22. Right
  23. 90
  24. 165
  25. 30
  26. 65
  27. 30
  28. 75
  29. 90
  30. 170
  31. 35
  32. 65
  33. 35
  34. 120
  35. Obtuse
  36. 120
  37. 160
  38. Acute
  39. 75
  40. 55

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