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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 221 · 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 80°. What is the other angle (in degrees)?
  2. 2.Two angles together make a straight line. One of them is 45°. What is the other angle (in degrees)?
  3. 3.Two angles of a triangle are 20° and 110°. What is the third angle (in degrees)?
  4. 4.Two angles together make a straight line. One of them is 130°. What is the other angle (in degrees)?
  5. 5.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  6. 6.An angle measures 180°. What kind of angle is it? (a) Acute (b) Straight (c) Right
  7. 7.Three angles meet at a point. Two of them are 50° and 250°. What is the third angle (in degrees)?
  8. 8.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  9. 9.Two angles together make a straight line. One of them is 90°. What is the other angle (in degrees)?
  10. 10.Two angles of a triangle are 70° and 50°. What is the third angle (in degrees)?
  11. 11.Two angles together make a straight line. One of them is 25°. What is the other angle (in degrees)?
  12. 12.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  13. 13.An angle measures 10°. What kind of angle is it? (a) Acute (b) Straight (c) Right
  14. 14.Two angles of a triangle are 20° and 125°. What is the third angle (in degrees)?
  15. 15.An angle measures 125°. What kind of angle is it? (a) Obtuse (b) Acute (c) Straight
  16. 16.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  17. 17.Three angles meet at a point. Two of them are 110° and 90°. What is the third angle (in degrees)?
  18. 18.Two angles of a triangle are 45° and 60°. What is the third angle (in degrees)?
  19. 19.Two angles together make a straight line. One of them is 135°. What is the other angle (in degrees)?
  20. 20.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  21. 21.Two angles of a triangle are 40° and 65°. What is the third angle (in degrees)?
  22. 22.An angle measures 65°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  23. 23.Three angles meet at a point. Two of them are 70° and 80°. What is the third angle (in degrees)?
  24. 24.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  25. 25.Three angles meet at a point. Two of them are 90° and 170°. What is the third angle (in degrees)?
  26. 26.Two angles of a triangle are 30° and 90°. What is the third angle (in degrees)?
  27. 27.A right angle is split into two angles. One of them is 50°. What is the other angle (in degrees)?
  28. 28.Two angles of a triangle are 45° and 40°. What is the third angle (in degrees)?
  29. 29.Two angles of a triangle are 25° and 130°. What is the third angle (in degrees)?
  30. 30.Two angles of a triangle are 95° and 20°. What is the third angle (in degrees)?
  31. 31.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  32. 32.Two angles together make a straight line. One of them is 70°. What is the other angle (in degrees)?
  33. 33.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  34. 34.Two angles of a triangle are 60° and 45°. What is the third angle (in degrees)?
  35. 35.Two angles together make a straight line. One of them is 65°. What is the other angle (in degrees)?
  36. 36.Two angles together make a straight line. One of them is 110°. What is the other angle (in degrees)?
  37. 37.Two angles together make a straight line. One of them is 105°. What is the other angle (in degrees)?
  38. 38.Two angles of a triangle are 75° and 100°. What is the third angle (in degrees)?
  39. 39.Two angles together make a straight line. One of them is 115°. What is the other angle (in degrees)?
  40. 40.Three angles meet at a point. Two of them are 130° and 160°. What is the third angle (in degrees)?

Answer key

  1. 100
  2. 135
  3. 50
  4. 50
  5. 80
  6. Straight
  7. 60
  8. 60
  9. 90
  10. 60
  11. 155
  12. 90
  13. Acute
  14. 35
  15. Obtuse
  16. 25
  17. 160
  18. 75
  19. 45
  20. 70
  21. 75
  22. Acute
  23. 210
  24. 150
  25. 100
  26. 60
  27. 40
  28. 95
  29. 25
  30. 65
  31. 180
  32. 110
  33. 85
  34. 75
  35. 115
  36. 70
  37. 75
  38. 5
  39. 65
  40. 70

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