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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 297 · 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 90° and 20°. What is the third angle (in degrees)?
  2. 2.Three angles meet at a point. Two of them are 120° and 50°. What is the third angle (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 35°. What is the other angle (in degrees)?
  4. 4.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  5. 5.Two angles of a triangle are 85° and 50°. What is the third 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 55° and 35°. What is the third angle (in degrees)?
  8. 8.Three angles meet at a point. Two of them are 50° and 240°. What is the third angle (in degrees)?
  9. 9.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  10. 10.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  11. 11.An angle measures 180°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  12. 12.Three angles meet at a point. Two of them are 150° and 100°. What is the third angle (in degrees)?
  13. 13.Three angles meet at a point. Two of them are 90° and 90°. What is the third angle (in degrees)?
  14. 14.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  15. 15.Two angles of a triangle are 20° and 45°. What is the third angle (in degrees)?
  16. 16.Two angles of a triangle are 25° and 65°. What is the third angle (in degrees)?
  17. 17.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  18. 18.Three angles meet at a point. Two of them are 70° and 70°. What is the third angle (in degrees)?
  19. 19.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  20. 20.Two angles of a triangle are 85° and 65°. What is the third angle (in degrees)?
  21. 21.Two angles together make a straight line. One of them is 130°. What is the other angle (in degrees)?
  22. 22.An angle measures 170°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  23. 23.Two angles of a triangle are 70° and 30°. What is the third angle (in degrees)?
  24. 24.Three angles meet at a point. Two of them are 80° and 180°. What is the third angle (in degrees)?
  25. 25.Two angles of a triangle are 85° and 75°. What is the third angle (in degrees)?
  26. 26.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  27. 27.Three angles meet at a point. Two of them are 140° and 110°. What is the third angle (in degrees)?
  28. 28.Two angles together make a straight line. One of them is 55°. What is the other angle (in degrees)?
  29. 29.Two angles of a triangle are 35° and 70°. What is the third angle (in degrees)?
  30. 30.An angle measures 150°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  31. 31.Two angles of a triangle are 75° and 40°. What is the third angle (in degrees)?
  32. 32.Two angles together make a straight line. One of them is 70°. What is the other angle (in degrees)?
  33. 33.Three angles meet at a point. Two of them are 110° and 120°. What is the third angle (in degrees)?
  34. 34.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  35. 35.Two angles of a triangle are 85° and 30°. What is the third angle (in degrees)?
  36. 36.Three angles meet at a point. Two of them are 60° and 230°. What is the third angle (in degrees)?
  37. 37.An angle measures 110°. What kind of angle is it? (a) Straight (b) Obtuse (c) Right
  38. 38.An angle measures 90°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  39. 39.Three angles meet at a point. Two of them are 120° and 150°. What is the third angle (in degrees)?
  40. 40.Three angles meet at a point. Two of them are 120° and 110°. What is the third angle (in degrees)?

Answer key

  1. 70
  2. 190
  3. 145
  4. 85
  5. 45
  6. 90
  7. 90
  8. 70
  9. 55
  10. 30
  11. Straight
  12. 110
  13. 180
  14. 60
  15. 115
  16. 90
  17. 25
  18. 220
  19. 65
  20. 30
  21. 50
  22. Obtuse
  23. 80
  24. 100
  25. 20
  26. 80
  27. 110
  28. 125
  29. 75
  30. Obtuse
  31. 65
  32. 110
  33. 130
  34. 90
  35. 65
  36. 70
  37. Obtuse
  38. Right
  39. 90
  40. 130

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