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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 99 · 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.Three angles meet at a point. Two of them are 80° and 50°. What is the third angle (in degrees)?
  2. 2.Two angles of a triangle are 100° and 75°. What is the third angle (in degrees)?
  3. 3.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  4. 4.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  5. 5.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  6. 6.Two angles of a triangle are 80° and 30°. What is the third angle (in degrees)?
  7. 7.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  8. 8.Two angles together make a straight line. One of them is 15°. What is the other angle (in degrees)?
  9. 9.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  10. 10.An angle measures 90°. What kind of angle is it? (a) Acute (b) Obtuse (c) Right
  11. 11.Two angles together make a straight line. One of them is 145°. 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 together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  14. 14.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  15. 15.Three angles meet at a point. Two of them are 90° and 130°. What is the third angle (in degrees)?
  16. 16.Three angles meet at a point. Two of them are 90° and 160°. What is the third angle (in degrees)?
  17. 17.Two angles together make a straight line. One of them is 155°. What is the other angle (in degrees)?
  18. 18.Two angles of a triangle are 40° and 125°. What is the third angle (in degrees)?
  19. 19.An angle measures 80°. What kind of angle is it? (a) Right (b) Acute (c) Obtuse
  20. 20.Two angles of a triangle are 20° and 110°. What is the third angle (in degrees)?
  21. 21.Three angles meet at a point. Two of them are 120° and 60°. What is the third angle (in degrees)?
  22. 22.An angle measures 100°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  23. 23.Two angles together make a straight line. One of them is 115°. What is the other angle (in degrees)?
  24. 24.An angle measures 120°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  25. 25.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  26. 26.An angle measures 35°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  27. 27.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  28. 28.Three angles meet at a point. Two of them are 120° and 90°. What is the third angle (in degrees)?
  29. 29.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  30. 30.An angle measures 180°. What kind of angle is it? (a) Straight (b) Acute (c) Right
  31. 31.A right angle is split into two angles. One of them is 45°. What is the other angle (in degrees)?
  32. 32.Two angles of a triangle are 35° and 35°. What is the third angle (in degrees)?
  33. 33.Two angles together make a straight line. One of them is 135°. What is the other angle (in degrees)?
  34. 34.Three angles meet at a point. Two of them are 140° and 70°. What is the third angle (in degrees)?
  35. 35.Two angles of a triangle are 35° and 120°. What is the third angle (in degrees)?
  36. 36.Two angles of a triangle are 55° and 25°. What is the third angle (in degrees)?
  37. 37.Three angles meet at a point. Two of them are 70° and 110°. What is the third angle (in degrees)?
  38. 38.Three angles meet at a point. Two of them are 80° and 70°. What is the third angle (in degrees)?
  39. 39.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  40. 40.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?

Answer key

  1. 230
  2. 5
  3. 90
  4. 70
  5. 90
  6. 70
  7. 60
  8. 165
  9. 30
  10. Right
  11. 35
  12. 50
  13. 150
  14. 60
  15. 140
  16. 110
  17. 25
  18. 15
  19. Acute
  20. 50
  21. 180
  22. Obtuse
  23. 65
  24. Obtuse
  25. 120
  26. Acute
  27. 150
  28. 150
  29. 75
  30. Straight
  31. 45
  32. 110
  33. 45
  34. 150
  35. 25
  36. 100
  37. 180
  38. 210
  39. 10
  40. 40

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