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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 308 · 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 25° and 75°. What is the third angle (in degrees)?
  2. 2.An angle measures 165°. What kind of angle is it? (a) Obtuse (b) Right (c) Straight
  3. 3.Two angles of a triangle are 40° and 55°. What is the third angle (in degrees)?
  4. 4.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  5. 5.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  6. 6.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  7. 7.Two angles together make a straight line. One of them is 150°. What is the other angle (in degrees)?
  8. 8.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?
  9. 9.Two angles of a triangle are 70° and 25°. What is the third angle (in degrees)?
  10. 10.Three angles meet at a point. Two of them are 80° and 90°. What is the third angle (in degrees)?
  11. 11.An angle measures 180°. What kind of angle is it? (a) Obtuse (b) Straight (c) Right
  12. 12.A right angle is split into two angles. One of them is 85°. What is the other 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 150°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  15. 15.Two angles of a triangle are 30° and 35°. What is the third angle (in degrees)?
  16. 16.An angle measures 120°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  17. 17.Two angles of a triangle are 80° and 20°. What is the third angle (in degrees)?
  18. 18.Three angles meet at a point. Two of them are 70° and 100°. What is the third angle (in degrees)?
  19. 19.Three angles meet at a point. Two of them are 80° and 210°. What is the third angle (in degrees)?
  20. 20.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  21. 21.Three angles meet at a point. Two of them are 130° and 60°. What is the third angle (in degrees)?
  22. 22.Two angles of a triangle are 80° and 80°. What is the third angle (in degrees)?
  23. 23.Two angles of a triangle are 65° and 70°. What is the third angle (in degrees)?
  24. 24.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  25. 25.What is the smaller angle between the hands of a clock at 8 o'clock (in degrees)?
  26. 26.An angle measures 90°. What kind of angle is it? (a) Right (b) Acute (c) Straight
  27. 27.Two angles of a triangle are 20° and 55°. What is the third angle (in degrees)?
  28. 28.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  29. 29.Two angles of a triangle are 50° and 110°. What is the third angle (in degrees)?
  30. 30.Two angles of a triangle are 50° and 80°. What is the third angle (in degrees)?
  31. 31.Two angles together make a straight line. One of them is 15°. What is the other angle (in degrees)?
  32. 32.A right angle is split into two angles. One of them is 60°. What is the other angle (in degrees)?
  33. 33.An angle measures 20°. What kind of angle is it? (a) Right (b) Acute (c) Straight
  34. 34.Two angles together make a straight line. One of them is 55°. What is the other angle (in degrees)?
  35. 35.An angle measures 110°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  36. 36.Two angles of a triangle are 80° and 35°. What is the third angle (in degrees)?
  37. 37.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  38. 38.A right angle is split into two angles. One of them is 75°. What is the other angle (in degrees)?
  39. 39.An angle measures 105°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  40. 40.Two angles of a triangle are 35° and 80°. What is the third angle (in degrees)?

Answer key

  1. 80
  2. Obtuse
  3. 85
  4. 35
  5. 80
  6. 120
  7. 30
  8. 85
  9. 85
  10. 190
  11. Straight
  12. 5
  13. 150
  14. Obtuse
  15. 115
  16. Obtuse
  17. 80
  18. 190
  19. 70
  20. 10
  21. 170
  22. 20
  23. 45
  24. 150
  25. 120
  26. Right
  27. 105
  28. 150
  29. 20
  30. 50
  31. 165
  32. 30
  33. Acute
  34. 125
  35. Obtuse
  36. 65
  37. 80
  38. 15
  39. Obtuse
  40. 65

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