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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 334 · 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 60° and 90°. What is the third angle (in degrees)?
  2. 2.Two angles of a triangle are 70° and 90°. What is the third angle (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  4. 4.Two angles of a triangle are 30° and 20°. What is the third angle (in degrees)?
  5. 5.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  6. 6.Two angles of a triangle are 70° and 80°. What is the third angle (in degrees)?
  7. 7.An angle measures 180°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  8. 8.An angle measures 90°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  9. 9.Two angles of a triangle are 20° and 55°. What is the third angle (in degrees)?
  10. 10.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  11. 11.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  12. 12.Two angles of a triangle are 100° and 70°. What is the third angle (in degrees)?
  13. 13.An angle measures 70°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  14. 14.Three angles meet at a point. Two of them are 60° and 220°. What is the third angle (in degrees)?
  15. 15.Two angles together make a straight line. One of them is 105°. What is the other angle (in degrees)?
  16. 16.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  17. 17.A right angle is split into two angles. One of them is 70°. What is the other angle (in degrees)?
  18. 18.Two angles of a triangle are 85° and 45°. What is the third angle (in degrees)?
  19. 19.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  20. 20.Three angles meet at a point. Two of them are 90° and 80°. What is the third angle (in degrees)?
  21. 21.Three angles meet at a point. Two of them are 70° and 220°. What is the third angle (in degrees)?
  22. 22.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  23. 23.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  24. 24.Two angles of a triangle are 40° and 70°. What is the third angle (in degrees)?
  25. 25.Two angles of a triangle are 20° and 95°. What is the third angle (in degrees)?
  26. 26.Two angles together make a straight line. One of them is 25°. What is the other angle (in degrees)?
  27. 27.Two angles of a triangle are 70° and 30°. What is the third angle (in degrees)?
  28. 28.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  29. 29.An angle measures 65°. What kind of angle is it? (a) Obtuse (b) Acute (c) Straight
  30. 30.Two angles of a triangle are 50° and 100°. What is the third angle (in degrees)?
  31. 31.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  32. 32.A right angle is split into two angles. One of them is 45°. 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 together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  35. 35.Two angles together make a straight line. One of them is 35°. What is the other angle (in degrees)?
  36. 36.Two angles together make a straight line. One of them is 65°. What is the other angle (in degrees)?
  37. 37.Two angles of a triangle are 20° and 80°. What is the third angle (in degrees)?
  38. 38.Two angles of a triangle are 85° and 50°. What is the third angle (in degrees)?
  39. 39.Three angles meet at a point. Two of them are 80° and 170°. What is the third angle (in degrees)?
  40. 40.Two angles of a triangle are 85° and 40°. What is the third angle (in degrees)?

Answer key

  1. 30
  2. 20
  3. 80
  4. 130
  5. 60
  6. 30
  7. Straight
  8. Right
  9. 105
  10. 30
  11. 150
  12. 10
  13. Acute
  14. 80
  15. 75
  16. 150
  17. 20
  18. 50
  19. 90
  20. 190
  21. 70
  22. 120
  23. 65
  24. 70
  25. 65
  26. 155
  27. 80
  28. 30
  29. Acute
  30. 30
  31. 75
  32. 45
  33. 85
  34. 160
  35. 145
  36. 115
  37. 80
  38. 45
  39. 110
  40. 55

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