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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 21 · 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 55° and 75°. What is the third angle (in degrees)?
  2. 2.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  3. 3.A right angle is split into two angles. One of them is 30°. What is the other angle (in degrees)?
  4. 4.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  5. 5.An angle measures 180°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  6. 6.An angle measures 150°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  7. 7.Three angles meet at a point. Two of them are 110° and 140°. What is the third angle (in degrees)?
  8. 8.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  9. 9.Three angles meet at a point. Two of them are 140° and 100°. What is the third angle (in degrees)?
  10. 10.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  11. 11.A right angle is split into two angles. One of them is 75°. What is the other angle (in degrees)?
  12. 12.Three angles meet at a point. Two of them are 140° and 80°. What is the third angle (in degrees)?
  13. 13.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  14. 14.An angle measures 130°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  15. 15.Two angles together make a straight line. One of them is 65°. What is the other angle (in degrees)?
  16. 16.Three angles meet at a point. Two of them are 100° and 70°. What is the third angle (in degrees)?
  17. 17.An angle measures 90°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  18. 18.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  19. 19.Two angles together make a straight line. One of them is 145°. What is the other angle (in degrees)?
  20. 20.An angle measures 55°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  21. 21.Three angles meet at a point. Two of them are 150° and 70°. What is the third angle (in degrees)?
  22. 22.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  23. 23.Two angles of a triangle are 75° and 30°. What is the third angle (in degrees)?
  24. 24.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  25. 25.Three angles meet at a point. Two of them are 140° and 160°. What is the third angle (in degrees)?
  26. 26.Two angles together make a straight line. One of them is 60°. What is the other angle (in degrees)?
  27. 27.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?
  28. 28.Three angles meet at a point. Two of them are 120° and 100°. What is the third angle (in degrees)?
  29. 29.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  30. 30.Three angles meet at a point. Two of them are 150° and 130°. What is the third angle (in degrees)?
  31. 31.Two angles together make a straight line. One of them is 165°. What is the other angle (in degrees)?
  32. 32.Two angles of a triangle are 65° and 45°. What is the third angle (in degrees)?
  33. 33.Three angles meet at a point. Two of them are 120° and 150°. What is the third angle (in degrees)?
  34. 34.Two angles of a triangle are 65° and 85°. What is the third angle (in degrees)?
  35. 35.Two angles of a triangle are 25° and 75°. What is the third angle (in degrees)?
  36. 36.Two angles together make a straight line. One of them is 70°. What is the other angle (in degrees)?
  37. 37.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  38. 38.Two angles of a triangle are 35° and 110°. What is the third angle (in degrees)?
  39. 39.Two angles together make a straight line. One of them is 55°. What is the other angle (in degrees)?
  40. 40.Two angles of a triangle are 100° and 25°. What is the third angle (in degrees)?

Answer key

  1. 50
  2. 85
  3. 60
  4. 30
  5. Straight
  6. Obtuse
  7. 110
  8. 90
  9. 120
  10. 35
  11. 15
  12. 140
  13. 150
  14. Obtuse
  15. 115
  16. 190
  17. Right
  18. 60
  19. 35
  20. Acute
  21. 140
  22. 65
  23. 75
  24. 140
  25. 60
  26. 120
  27. 40
  28. 140
  29. 25
  30. 80
  31. 15
  32. 70
  33. 90
  34. 30
  35. 80
  36. 110
  37. 75
  38. 35
  39. 125
  40. 55

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