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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 355 · 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 15°. What is the other angle (in degrees)?
  2. 2.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 55°. 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.Three angles meet at a point. Two of them are 70° and 120°. What is the third angle (in degrees)?
  6. 6.Two angles of a triangle are 40° and 40°. What is the third angle (in degrees)?
  7. 7.Two angles of a triangle are 55° and 115°. What is the third angle (in degrees)?
  8. 8.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  9. 9.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  10. 10.An angle measures 75°. What kind of angle is it? (a) Straight (b) Acute (c) Right
  11. 11.An angle measures 180°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  12. 12.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  13. 13.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  14. 14.An angle measures 30°. What kind of angle is it? (a) Obtuse (b) Acute (c) Straight
  15. 15.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  16. 16.Two angles of a triangle are 40° and 80°. What is the third angle (in degrees)?
  17. 17.Two angles of a triangle are 25° and 50°. What is the third angle (in degrees)?
  18. 18.An angle measures 25°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  19. 19.An angle measures 125°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  20. 20.Two angles together make a straight line. One of them is 45°. What is the other angle (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 60°. What is the other angle (in degrees)?
  23. 23.Three angles meet at a point. Two of them are 70° and 50°. What is the third angle (in degrees)?
  24. 24.Three angles meet at a point. Two of them are 110° and 90°. What is the third angle (in degrees)?
  25. 25.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  26. 26.Three angles meet at a point. Two of them are 50° and 50°. What is the third angle (in degrees)?
  27. 27.Two angles of a triangle are 55° and 65°. What is the third angle (in degrees)?
  28. 28.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  29. 29.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  30. 30.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  31. 31.An angle measures 90°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  32. 32.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  33. 33.Two angles of a triangle are 95° and 55°. What is the third angle (in degrees)?
  34. 34.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  35. 35.An angle measures 165°. What kind of angle is it? (a) Obtuse (b) Acute (c) Straight
  36. 36.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  37. 37.Two angles together make a straight line. One of them is 110°. What is the other angle (in degrees)?
  38. 38.Two angles together make a straight line. One of them is 155°. What is the other angle (in degrees)?
  39. 39.Two angles of a triangle are 20° and 40°. What is the third angle (in degrees)?
  40. 40.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?

Answer key

  1. 75
  2. 65
  3. 125
  4. 40
  5. 170
  6. 100
  7. 10
  8. 90
  9. 150
  10. Acute
  11. Straight
  12. 30
  13. 90
  14. Acute
  15. 180
  16. 60
  17. 105
  18. Acute
  19. Obtuse
  20. 135
  21. 20
  22. 120
  23. 240
  24. 160
  25. 120
  26. 260
  27. 60
  28. 55
  29. 5
  30. 50
  31. Right
  32. 35
  33. 30
  34. 80
  35. Obtuse
  36. 85
  37. 70
  38. 25
  39. 120
  40. 60

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