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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 380 · 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 150° and 110°. What is the third angle (in degrees)?
  2. 2.Two angles of a triangle are 25° and 45°. What is the third angle (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  4. 4.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  5. 5.Three angles meet at a point. Two of them are 120° and 120°. What is the third angle (in degrees)?
  6. 6.Three angles meet at a point. Two of them are 90° and 150°. What is the third angle (in degrees)?
  7. 7.An angle measures 65°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  8. 8.Two angles together make a straight line. One of them is 155°. What is the other angle (in degrees)?
  9. 9.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  10. 10.Two angles of a triangle are 20° and 20°. What is the third angle (in degrees)?
  11. 11.An angle measures 40°. What kind of angle is it? (a) Straight (b) Right (c) Acute
  12. 12.An angle measures 160°. What kind of angle is it? (a) Straight (b) Obtuse (c) Right
  13. 13.Three angles meet at a point. Two of them are 120° and 50°. What is the third angle (in degrees)?
  14. 14.A right angle is split into two angles. One of them is 60°. What is the other angle (in degrees)?
  15. 15.An angle measures 175°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  16. 16.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  17. 17.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  18. 18.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  19. 19.Three angles meet at a point. Two of them are 130° and 90°. What is the third angle (in degrees)?
  20. 20.A right angle is split into two angles. One of them is 50°. What is the other angle (in degrees)?
  21. 21.An angle measures 180°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse
  22. 22.Two angles together make a straight line. One of them is 70°. What is the other angle (in degrees)?
  23. 23.Two angles of a triangle are 90° and 30°. What is the third angle (in degrees)?
  24. 24.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?
  25. 25.An angle measures 165°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  26. 26.Two angles together make a straight line. One of them is 160°. What is the other angle (in degrees)?
  27. 27.A right angle is split into two angles. One of them is 30°. What is the other angle (in degrees)?
  28. 28.An angle measures 115°. What kind of angle is it? (a) Right (b) Obtuse (c) Straight
  29. 29.Two angles together make a straight line. One of them is 50°. What is the other angle (in degrees)?
  30. 30.Two angles together make a straight line. One of them is 135°. What is the other angle (in degrees)?
  31. 31.Two angles of a triangle are 25° and 50°. What is the third angle (in degrees)?
  32. 32.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  33. 33.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  34. 34.Two angles together make a straight line. One of them is 80°. What is the other angle (in degrees)?
  35. 35.Two angles of a triangle are 30° and 60°. What is the third angle (in degrees)?
  36. 36.Two angles together make a straight line. One of them is 105°. What is the other angle (in degrees)?
  37. 37.A right angle is split into two angles. One of them is 45°. What is the other angle (in degrees)?
  38. 38.Two angles of a triangle are 65° and 95°. What is the third angle (in degrees)?
  39. 39.An angle measures 60°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  40. 40.Two angles of a triangle are 70° and 45°. What is the third angle (in degrees)?

Answer key

  1. 100
  2. 110
  3. 150
  4. 80
  5. 120
  6. 120
  7. Acute
  8. 25
  9. 90
  10. 140
  11. Acute
  12. Obtuse
  13. 190
  14. 30
  15. Obtuse
  16. 75
  17. 30
  18. 60
  19. 140
  20. 40
  21. Straight
  22. 110
  23. 60
  24. 85
  25. Obtuse
  26. 20
  27. 60
  28. Obtuse
  29. 130
  30. 45
  31. 105
  32. 70
  33. 55
  34. 100
  35. 90
  36. 75
  37. 45
  38. 20
  39. Acute
  40. 65

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