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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 180 · 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 20°. What is the other angle (in degrees)?
  2. 2.Three angles meet at a point. Two of them are 100° and 50°. What is the third angle (in degrees)?
  3. 3.Two angles of a triangle are 30° and 90°. What is the third angle (in degrees)?
  4. 4.Three angles meet at a point. Two of them are 90° and 210°. What is the third angle (in degrees)?
  5. 5.An angle measures 180°. What kind of angle is it? (a) Right (b) Straight (c) Obtuse
  6. 6.Two angles of a triangle are 95° and 65°. What is the third angle (in degrees)?
  7. 7.A right angle is split into two angles. One of them is 45°. What is the other angle (in degrees)?
  8. 8.Three angles meet at a point. Two of them are 80° and 110°. What is the third angle (in degrees)?
  9. 9.Two angles of a triangle are 40° and 20°. What is the third angle (in degrees)?
  10. 10.An angle measures 175°. What kind of angle is it? (a) Right (b) Acute (c) Obtuse
  11. 11.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?
  12. 12.Two angles of a triangle are 70° and 105°. What is the third angle (in degrees)?
  13. 13.Three angles meet at a point. Two of them are 150° and 100°. What is the third angle (in degrees)?
  14. 14.Two angles together make a straight line. One of them is 85°. What is the other angle (in degrees)?
  15. 15.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  16. 16.Two angles together make a straight line. One of them is 55°. What is the other angle (in degrees)?
  17. 17.Three angles meet at a point. Two of them are 100° and 70°. What is the third angle (in degrees)?
  18. 18.An angle measures 90°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  19. 19.Three angles meet at a point. Two of them are 130° and 50°. What is the third angle (in degrees)?
  20. 20.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  21. 21.Two angles together make a straight line. One of them is 145°. What is the other angle (in degrees)?
  22. 22.An angle measures 65°. What kind of angle is it? (a) Right (b) Acute (c) Obtuse
  23. 23.Three angles meet at a point. Two of them are 80° and 150°. What is the third angle (in degrees)?
  24. 24.Three angles meet at a point. Two of them are 70° and 90°. What is the third angle (in degrees)?
  25. 25.A right angle is split into two angles. One of them is 70°. What is the other angle (in degrees)?
  26. 26.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  27. 27.A right angle is split into two angles. One of them is 75°. What is the other angle (in degrees)?
  28. 28.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  29. 29.Two angles of a triangle are 40° and 75°. What is the third angle (in degrees)?
  30. 30.An angle measures 60°. What kind of angle is it? (a) Right (b) Acute (c) Obtuse
  31. 31.An angle measures 105°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  32. 32.An angle measures 30°. What kind of angle is it? (a) Obtuse (b) Straight (c) Acute
  33. 33.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  34. 34.Two angles together make a straight line. One of them is 45°. What is the other angle (in degrees)?
  35. 35.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  36. 36.An angle measures 125°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  37. 37.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  38. 38.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  39. 39.Two angles together make a straight line. One of them is 90°. What is the other angle (in degrees)?
  40. 40.A right angle is split into two angles. One of them is 60°. What is the other angle (in degrees)?

Answer key

  1. 70
  2. 210
  3. 60
  4. 60
  5. Straight
  6. 20
  7. 45
  8. 170
  9. 120
  10. Obtuse
  11. 40
  12. 5
  13. 110
  14. 95
  15. 180
  16. 125
  17. 190
  18. Right
  19. 180
  20. 60
  21. 35
  22. Acute
  23. 130
  24. 200
  25. 20
  26. 5
  27. 15
  28. 65
  29. 65
  30. Acute
  31. Obtuse
  32. Acute
  33. 150
  34. 135
  35. 30
  36. Obtuse
  37. 35
  38. 150
  39. 90
  40. 30

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