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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 559 · 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 together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  2. 2.Two angles together make a straight line. One of them is 60°. What is the other angle (in degrees)?
  3. 3.Two angles of a triangle are 55° and 80°. What is the third angle (in degrees)?
  4. 4.An angle measures 90°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  5. 5.Two angles of a triangle are 75° and 85°. What is the third angle (in degrees)?
  6. 6.An angle measures 40°. What kind of angle is it? (a) Acute (b) Straight (c) Right
  7. 7.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  8. 8.An angle measures 20°. What kind of angle is it? (a) Obtuse (b) Straight (c) Acute
  9. 9.Three angles meet at a point. Two of them are 130° and 140°. What is the third angle (in degrees)?
  10. 10.Two angles together make a straight line. One of them is 65°. What is the other angle (in degrees)?
  11. 11.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  12. 12.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  13. 13.Three angles meet at a point. Two of them are 70° and 70°. What is the third angle (in degrees)?
  14. 14.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  15. 15.A right angle is split into two angles. One of them is 60°. What is the other angle (in degrees)?
  16. 16.Two angles together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  17. 17.Two angles of a triangle are 55° and 20°. What is the third angle (in degrees)?
  18. 18.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  19. 19.An angle measures 110°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  20. 20.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  21. 21.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  22. 22.An angle measures 180°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  23. 23.An angle measures 45°. What kind of angle is it? (a) Obtuse (b) Acute (c) Straight
  24. 24.Two angles of a triangle are 20° and 115°. What is the third angle (in degrees)?
  25. 25.An angle measures 65°. What kind of angle is it? (a) Straight (b) Acute (c) Right
  26. 26.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  27. 27.Two angles of a triangle are 65° and 70°. What is the third angle (in degrees)?
  28. 28.Two angles together make a straight line. One of them is 90°. What is the other angle (in degrees)?
  29. 29.An angle measures 10°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  30. 30.Two angles of a triangle are 20° and 60°. What is the third angle (in degrees)?
  31. 31.Two angles together make a straight line. One of them is 155°. What is the other angle (in degrees)?
  32. 32.A right angle is split into two angles. One of them is 50°. What is the other angle (in degrees)?
  33. 33.Two angles of a triangle are 30° and 55°. What is the third angle (in degrees)?
  34. 34.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  35. 35.Two angles of a triangle are 70° and 30°. What is the third angle (in degrees)?
  36. 36.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  37. 37.Two angles of a triangle are 95° and 25°. What is the third angle (in degrees)?
  38. 38.Three angles meet at a point. Two of them are 60° and 110°. What is the third angle (in degrees)?
  39. 39.A right angle is split into two angles. One of them is 75°. What is the other angle (in degrees)?
  40. 40.Two angles of a triangle are 55° and 100°. What is the third angle (in degrees)?

Answer key

  1. 170
  2. 120
  3. 45
  4. Right
  5. 20
  6. Acute
  7. 70
  8. Acute
  9. 90
  10. 115
  11. 80
  12. 65
  13. 220
  14. 30
  15. 30
  16. 160
  17. 105
  18. 55
  19. Obtuse
  20. 180
  21. 85
  22. Straight
  23. Acute
  24. 45
  25. Acute
  26. 120
  27. 45
  28. 90
  29. Acute
  30. 100
  31. 25
  32. 40
  33. 95
  34. 25
  35. 80
  36. 90
  37. 60
  38. 190
  39. 15
  40. 25

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