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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 604 · 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.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  2. 2.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 55°. What is the other angle (in degrees)?
  4. 4.Two angles together make a straight line. One of them is 135°. What is the other angle (in degrees)?
  5. 5.An angle measures 180°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse
  6. 6.An angle measures 90°. What kind of angle is it? (a) Acute (b) Straight (c) Right
  7. 7.Two angles together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  8. 8.Two angles of a triangle are 75° and 50°. What is the third angle (in degrees)?
  9. 9.Two angles together make a straight line. One of them is 145°. What is the other angle (in degrees)?
  10. 10.Two angles together make a straight line. One of them is 130°. What is the other angle (in degrees)?
  11. 11.Two angles of a triangle are 85° and 65°. What is the third angle (in degrees)?
  12. 12.An angle measures 120°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  13. 13.Three angles meet at a point. Two of them are 120° and 140°. What is the third angle (in degrees)?
  14. 14.Two angles of a triangle are 95° and 25°. What is the third angle (in degrees)?
  15. 15.A right angle is split into two angles. One of them is 75°. What is the other angle (in degrees)?
  16. 16.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  17. 17.An angle measures 110°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  18. 18.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  19. 19.A right angle is split into two angles. One of them is 30°. What is the other angle (in degrees)?
  20. 20.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  21. 21.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  22. 22.Two angles together make a straight line. One of them is 50°. What is the other angle (in degrees)?
  23. 23.Two angles of a triangle are 50° and 60°. What is the third angle (in degrees)?
  24. 24.A right angle is split into two angles. One of them is 35°. What is the other angle (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 100°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  27. 27.Two angles of a triangle are 45° and 95°. What is the third angle (in degrees)?
  28. 28.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  29. 29.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  30. 30.Two angles together make a straight line. One of them is 150°. What is the other angle (in degrees)?
  31. 31.An angle measures 165°. What kind of angle is it? (a) Right (b) Acute (c) Obtuse
  32. 32.Three angles meet at a point. Two of them are 50° and 130°. What is the third angle (in degrees)?
  33. 33.Two angles together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  34. 34.Three angles meet at a point. Two of them are 110° and 50°. What is the third angle (in degrees)?
  35. 35.A right angle is split into two angles. One of them is 70°. What is the other angle (in degrees)?
  36. 36.Two angles of a triangle are 25° and 135°. What is the third angle (in degrees)?
  37. 37.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  38. 38.An angle measures 45°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  39. 39.Three angles meet at a point. Two of them are 140° and 120°. What is the third angle (in degrees)?
  40. 40.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?

Answer key

  1. 35
  2. 85
  3. 125
  4. 45
  5. Straight
  6. Right
  7. 170
  8. 55
  9. 35
  10. 50
  11. 30
  12. Obtuse
  13. 100
  14. 60
  15. 15
  16. 30
  17. Obtuse
  18. 150
  19. 60
  20. 150
  21. 180
  22. 130
  23. 70
  24. 55
  25. 120
  26. Obtuse
  27. 40
  28. 70
  29. 80
  30. 30
  31. Obtuse
  32. 180
  33. 160
  34. 200
  35. 20
  36. 20
  37. 150
  38. Acute
  39. 100
  40. 90

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