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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 312 · 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 75°. What is the other angle (in degrees)?
  2. 2.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 155°. What is the other angle (in degrees)?
  4. 4.Two angles together make a straight line. One of them is 60°. What is the other angle (in degrees)?
  5. 5.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?
  6. 6.Two angles together make a straight line. One of them is 165°. What is the other angle (in degrees)?
  7. 7.An angle measures 25°. What kind of angle is it? (a) Right (b) Acute (c) Obtuse
  8. 8.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?
  9. 9.Three angles meet at a point. Two of them are 70° and 50°. What is the third angle (in degrees)?
  10. 10.Three angles meet at a point. Two of them are 50° and 60°. What is the third angle (in degrees)?
  11. 11.Two angles of a triangle are 90° and 50°. What is the third angle (in degrees)?
  12. 12.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  13. 13.An angle measures 10°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  14. 14.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  15. 15.Two angles of a triangle are 100° and 70°. What is the third angle (in degrees)?
  16. 16.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  17. 17.Two angles of a triangle are 45° and 75°. What is the third angle (in degrees)?
  18. 18.An angle measures 90°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  19. 19.An angle measures 135°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  20. 20.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  21. 21.An angle measures 55°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  22. 22.Three angles meet at a point. Two of them are 60° and 50°. What is the third angle (in degrees)?
  23. 23.Two angles together make a straight line. One of them is 55°. What is the other angle (in degrees)?
  24. 24.Two angles of a triangle are 35° and 55°. What is the third angle (in degrees)?
  25. 25.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  26. 26.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  27. 27.An angle measures 120°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  28. 28.Two angles together make a straight line. One of them is 15°. What is the other angle (in degrees)?
  29. 29.Two angles of a triangle are 90° and 25°. What is the third angle (in degrees)?
  30. 30.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  31. 31.An angle measures 140°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  32. 32.Two angles together make a straight line. One of them is 50°. What is the other angle (in degrees)?
  33. 33.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  34. 34.Two angles of a triangle are 20° and 95°. What is the third angle (in degrees)?
  35. 35.Three angles meet at a point. Two of them are 150° and 120°. What is the third angle (in degrees)?
  36. 36.An angle measures 125°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  37. 37.An angle measures 15°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse
  38. 38.An angle measures 180°. What kind of angle is it? (a) Right (b) Straight (c) Acute
  39. 39.An angle measures 115°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  40. 40.An angle measures 75°. What kind of angle is it? (a) Straight (b) Right (c) Acute

Answer key

  1. 15
  2. 25
  3. 25
  4. 120
  5. 85
  6. 15
  7. Acute
  8. 40
  9. 240
  10. 250
  11. 40
  12. 150
  13. Acute
  14. 140
  15. 10
  16. 90
  17. 60
  18. Right
  19. Obtuse
  20. 30
  21. Acute
  22. 250
  23. 125
  24. 90
  25. 10
  26. 80
  27. Obtuse
  28. 165
  29. 65
  30. 150
  31. Obtuse
  32. 130
  33. 120
  34. 65
  35. 90
  36. Obtuse
  37. Acute
  38. Straight
  39. Obtuse
  40. Acute

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