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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 343 · 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 80° and 20°. What is the third angle (in degrees)?
  2. 2.An angle measures 180°. What kind of angle is it? (a) Straight (b) Right (c) Acute
  3. 3.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  4. 4.A right angle is split into two angles. One of them is 50°. What is the other angle (in degrees)?
  5. 5.An angle measures 175°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  6. 6.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  7. 7.An angle measures 120°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  8. 8.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  9. 9.Three angles meet at a point. Two of them are 150° and 90°. What is the third angle (in degrees)?
  10. 10.Two angles together make a straight line. One of them is 15°. What is the other angle (in degrees)?
  11. 11.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?
  12. 12.Two angles together make a straight line. One of them is 160°. What is the other angle (in degrees)?
  13. 13.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  14. 14.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  15. 15.Two angles of a triangle are 70° and 70°. What is the third angle (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.Two angles together make a straight line. One of them is 50°. What is the other angle (in degrees)?
  18. 18.Two angles of a triangle are 70° and 85°. What is the third angle (in degrees)?
  19. 19.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  20. 20.A right angle is split into two angles. One of them is 70°. What is the other angle (in degrees)?
  21. 21.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  22. 22.An angle measures 40°. What kind of angle is it? (a) Straight (b) Acute (c) Right
  23. 23.Three angles meet at a point. Two of them are 130° and 90°. What is the third angle (in degrees)?
  24. 24.Two angles together make a straight line. One of them is 25°. What is the other angle (in degrees)?
  25. 25.Two angles together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  26. 26.Two angles together make a straight line. One of them is 70°. What is the other angle (in degrees)?
  27. 27.Two angles together make a straight line. One of them is 115°. What is the other angle (in degrees)?
  28. 28.Two angles of a triangle are 35° and 140°. What is the third angle (in degrees)?
  29. 29.An angle measures 90°. What kind of angle is it? (a) Straight (b) Acute (c) Right
  30. 30.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  31. 31.An angle measures 35°. What kind of angle is it? (a) Straight (b) Right (c) Acute
  32. 32.Two angles of a triangle are 70° and 95°. What is the third angle (in degrees)?
  33. 33.An angle measures 55°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  34. 34.An angle measures 45°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  35. 35.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  36. 36.Two angles of a triangle are 95° and 75°. What is the third angle (in degrees)?
  37. 37.Two angles of a triangle are 45° and 125°. What is the third angle (in degrees)?
  38. 38.Three angles meet at a point. Two of them are 70° and 120°. What is the third angle (in degrees)?
  39. 39.Two angles together make a straight line. One of them is 65°. What is the other angle (in degrees)?
  40. 40.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?

Answer key

  1. 80
  2. Straight
  3. 65
  4. 40
  5. Obtuse
  6. 180
  7. Obtuse
  8. 10
  9. 120
  10. 165
  11. 40
  12. 20
  13. 140
  14. 85
  15. 40
  16. 70
  17. 130
  18. 25
  19. 50
  20. 20
  21. 5
  22. Acute
  23. 140
  24. 155
  25. 170
  26. 110
  27. 65
  28. 5
  29. Right
  30. 75
  31. Acute
  32. 15
  33. Acute
  34. Acute
  35. 80
  36. 10
  37. 10
  38. 170
  39. 115
  40. 30

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