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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 399 · 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 55° and 60°. What is the third angle (in degrees)?
  2. 2.Two angles together make a straight line. One of them is 80°. What is the other angle (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 160°. What is the other angle (in degrees)?
  4. 4.Two angles of a triangle are 50° and 45°. What is the third angle (in degrees)?
  5. 5.Three angles meet at a point. Two of them are 100° and 50°. What is the third angle (in degrees)?
  6. 6.Three angles meet at a point. Two of them are 130° and 100°. What is the third angle (in degrees)?
  7. 7.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  8. 8.Two angles together make a straight line. One of them is 25°. What is the other angle (in degrees)?
  9. 9.Two angles of a triangle are 65° and 100°. What is the third angle (in degrees)?
  10. 10.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  11. 11.Three angles meet at a point. Two of them are 90° and 80°. What is the third angle (in degrees)?
  12. 12.Two angles together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  13. 13.Two angles of a triangle are 25° and 110°. What is the third angle (in degrees)?
  14. 14.An angle measures 90°. What kind of angle is it? (a) Straight (b) Right (c) Acute
  15. 15.Two angles of a triangle are 20° and 120°. What is the third angle (in degrees)?
  16. 16.Three angles meet at a point. Two of them are 50° and 210°. What is the third angle (in degrees)?
  17. 17.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  18. 18.A right angle is split into two angles. One of them is 80°. What is the other angle (in degrees)?
  19. 19.Three angles meet at a point. Two of them are 120° and 140°. What is the third angle (in degrees)?
  20. 20.Two angles together make a straight line. One of them is 65°. What is the other angle (in degrees)?
  21. 21.Two angles together make a straight line. One of them is 55°. What is the other angle (in degrees)?
  22. 22.Three angles meet at a point. Two of them are 60° and 200°. What is the third angle (in degrees)?
  23. 23.Two angles together make a straight line. One of them is 155°. What is the other angle (in degrees)?
  24. 24.An angle measures 30°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  25. 25.Two angles of a triangle are 30° and 125°. What is the third angle (in degrees)?
  26. 26.A right angle is split into two angles. One of them is 45°. What is the other angle (in degrees)?
  27. 27.Two angles together make a straight line. One of them is 145°. What is the other angle (in degrees)?
  28. 28.Two angles of a triangle are 50° and 30°. What is the third angle (in degrees)?
  29. 29.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  30. 30.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  31. 31.Two angles together make a straight line. One of them is 150°. What is the other angle (in degrees)?
  32. 32.Two angles together make a straight line. One of them is 60°. What is the other angle (in degrees)?
  33. 33.Three angles meet at a point. Two of them are 50° and 190°. What is the third angle (in degrees)?
  34. 34.Two angles together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  35. 35.Two angles of a triangle are 70° and 20°. What is the third angle (in degrees)?
  36. 36.Two angles together make a straight line. One of them is 115°. What is the other angle (in degrees)?
  37. 37.Two angles of a triangle are 75° and 30°. What is the third angle (in degrees)?
  38. 38.An angle measures 140°. What kind of angle is it? (a) Right (b) Acute (c) Obtuse
  39. 39.Two angles of a triangle are 35° and 45°. What is the third angle (in degrees)?
  40. 40.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?

Answer key

  1. 65
  2. 100
  3. 20
  4. 85
  5. 210
  6. 130
  7. 80
  8. 155
  9. 15
  10. 35
  11. 190
  12. 170
  13. 45
  14. Right
  15. 40
  16. 100
  17. 30
  18. 10
  19. 100
  20. 115
  21. 125
  22. 100
  23. 25
  24. Acute
  25. 25
  26. 45
  27. 35
  28. 100
  29. 60
  30. 50
  31. 30
  32. 120
  33. 120
  34. 160
  35. 90
  36. 65
  37. 75
  38. Obtuse
  39. 100
  40. 150

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