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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 553 · 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.An angle measures 180°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  2. 2.Two angles of a triangle are 55° and 80°. What is the third angle (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 65°. What is the other angle (in degrees)?
  4. 4.Two angles together make a straight line. One of them is 60°. What is the other angle (in degrees)?
  5. 5.Two angles together make a straight line. One of them is 135°. What is the other angle (in degrees)?
  6. 6.What is the smaller angle between the hands of a clock at 8 o'clock (in degrees)?
  7. 7.A right angle is split into two angles. One of them is 35°. What is the other angle (in degrees)?
  8. 8.Two angles of a triangle are 55° and 75°. What is the third angle (in degrees)?
  9. 9.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?
  10. 10.Two angles of a triangle are 75° and 90°. What is the third angle (in degrees)?
  11. 11.An angle measures 90°. What kind of angle is it? (a) Straight (b) Obtuse (c) Right
  12. 12.Two angles of a triangle are 90° and 85°. What is the third angle (in degrees)?
  13. 13.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  14. 14.Two angles of a triangle are 80° and 85°. What is the third angle (in degrees)?
  15. 15.An angle measures 55°. What kind of angle is it? (a) Straight (b) Right (c) Acute
  16. 16.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  17. 17.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  18. 18.Three angles meet at a point. Two of them are 130° and 120°. What is the third angle (in degrees)?
  19. 19.Two angles together make a straight line. One of them is 130°. What is the other angle (in degrees)?
  20. 20.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  21. 21.Two angles of a triangle are 40° and 40°. What is the third angle (in degrees)?
  22. 22.Three angles meet at a point. Two of them are 90° and 60°. What is the third angle (in degrees)?
  23. 23.Two angles together make a straight line. One of them is 50°. What is the other angle (in degrees)?
  24. 24.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  25. 25.A right angle is split into two angles. One of them is 60°. What is the other angle (in degrees)?
  26. 26.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  27. 27.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  28. 28.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  29. 29.Two angles together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  30. 30.Three angles meet at a point. Two of them are 150° and 100°. What is the third angle (in degrees)?
  31. 31.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  32. 32.An angle measures 80°. What kind of angle is it? (a) Acute (b) Straight (c) Right
  33. 33.Two angles of a triangle are 35° and 20°. What is the third angle (in degrees)?
  34. 34.Two angles of a triangle are 20° and 35°. What is the third angle (in degrees)?
  35. 35.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  36. 36.An angle measures 165°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  37. 37.Three angles meet at a point. Two of them are 80° and 70°. What is the third angle (in degrees)?
  38. 38.Two angles together make a straight line. One of them is 90°. What is the other angle (in degrees)?
  39. 39.Three angles meet at a point. Two of them are 70° and 120°. What is the third angle (in degrees)?
  40. 40.Two angles of a triangle are 75° and 20°. What is the third angle (in degrees)?

Answer key

  1. Straight
  2. 45
  3. 115
  4. 120
  5. 45
  6. 120
  7. 55
  8. 50
  9. 85
  10. 15
  11. Right
  12. 5
  13. 90
  14. 15
  15. Acute
  16. 70
  17. 10
  18. 110
  19. 50
  20. 50
  21. 100
  22. 210
  23. 130
  24. 5
  25. 30
  26. 180
  27. 35
  28. 150
  29. 170
  30. 110
  31. 80
  32. Acute
  33. 125
  34. 125
  35. 65
  36. Obtuse
  37. 210
  38. 90
  39. 170
  40. 85

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