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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 481 · 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.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  2. 2.Two angles of a triangle are 45° and 40°. What is the third angle (in degrees)?
  3. 3.Two angles of a triangle are 70° and 70°. What is the third angle (in degrees)?
  4. 4.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  5. 5.Two angles together make a straight line. One of them is 145°. What is the other angle (in degrees)?
  6. 6.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  7. 7.Two angles of a triangle are 50° and 115°. What is the third angle (in degrees)?
  8. 8.Three angles meet at a point. Two of them are 60° and 240°. What is the third angle (in degrees)?
  9. 9.Three angles meet at a point. Two of them are 70° and 120°. What is the third angle (in degrees)?
  10. 10.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  11. 11.Two angles together make a straight line. One of them is 170°. What is the other angle (in degrees)?
  12. 12.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  13. 13.Two angles of a triangle are 70° and 40°. What is the third angle (in degrees)?
  14. 14.An angle measures 90°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  15. 15.Three angles meet at a point. Two of them are 60° and 80°. What is the third angle (in degrees)?
  16. 16.An angle measures 180°. What kind of angle is it? (a) Straight (b) Acute (c) Right
  17. 17.Two angles of a triangle are 25° and 75°. What is the third angle (in degrees)?
  18. 18.An angle measures 75°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  19. 19.An angle measures 85°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  20. 20.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  21. 21.Two angles together make a straight line. One of them is 160°. What is the other angle (in degrees)?
  22. 22.Two angles together make a straight line. One of them is 105°. What is the other angle (in degrees)?
  23. 23.Two angles of a triangle are 75° and 75°. What is the third angle (in degrees)?
  24. 24.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  25. 25.Three angles meet at a point. Two of them are 80° and 50°. What is the third angle (in degrees)?
  26. 26.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  27. 27.Three angles meet at a point. Two of them are 90° and 50°. What is the third angle (in degrees)?
  28. 28.Two angles of a triangle are 25° and 120°. What is the third angle (in degrees)?
  29. 29.Three angles meet at a point. Two of them are 110° and 90°. What is the third angle (in degrees)?
  30. 30.An angle measures 80°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  31. 31.Three angles meet at a point. Two of them are 50° and 80°. What is the third angle (in degrees)?
  32. 32.Two angles together make a straight line. One of them is 55°. What is the other angle (in degrees)?
  33. 33.Two angles of a triangle are 25° and 125°. What is the third angle (in degrees)?
  34. 34.A right angle is split into two angles. One of them is 50°. What is the other angle (in degrees)?
  35. 35.Two angles of a triangle are 80° and 30°. What is the third angle (in degrees)?
  36. 36.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  37. 37.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  38. 38.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  39. 39.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  40. 40.Two angles of a triangle are 55° and 50°. What is the third angle (in degrees)?

Answer key

  1. 80
  2. 95
  3. 40
  4. 150
  5. 35
  6. 90
  7. 15
  8. 60
  9. 170
  10. 55
  11. 10
  12. 50
  13. 70
  14. Right
  15. 220
  16. Straight
  17. 80
  18. Acute
  19. Acute
  20. 30
  21. 20
  22. 75
  23. 30
  24. 60
  25. 230
  26. 120
  27. 220
  28. 35
  29. 160
  30. Acute
  31. 230
  32. 125
  33. 30
  34. 40
  35. 70
  36. 70
  37. 80
  38. 30
  39. 75
  40. 75

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