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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 370 · 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 together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  2. 2.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 130°. What is the other angle (in degrees)?
  4. 4.Two angles of a triangle are 25° and 35°. What is the third angle (in degrees)?
  5. 5.Three angles meet at a point. Two of them are 100° and 130°. What is the third angle (in degrees)?
  6. 6.Two angles of a triangle are 90° and 20°. What is the third angle (in degrees)?
  7. 7.An angle measures 130°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  8. 8.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  9. 9.Three angles meet at a point. Two of them are 90° and 70°. What is the third angle (in degrees)?
  10. 10.Three angles meet at a point. Two of them are 110° and 120°. What is the third angle (in degrees)?
  11. 11.Two angles of a triangle are 25° and 145°. What is the third angle (in degrees)?
  12. 12.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  13. 13.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  14. 14.Two angles of a triangle are 100° and 40°. What is the third angle (in degrees)?
  15. 15.Three angles meet at a point. Two of them are 50° and 90°. What is the third angle (in degrees)?
  16. 16.Two angles of a triangle are 100° and 45°. What is the third angle (in degrees)?
  17. 17.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  18. 18.Two angles of a triangle are 70° and 55°. What is the third angle (in degrees)?
  19. 19.Two angles together make a straight line. One of them is 35°. What is the other angle (in degrees)?
  20. 20.Two angles together make a straight line. One of them is 115°. What is the other angle (in degrees)?
  21. 21.Two angles together make a straight line. One of them is 45°. What is the other angle (in degrees)?
  22. 22.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?
  23. 23.Three angles meet at a point. Two of them are 100° and 50°. What is the third angle (in degrees)?
  24. 24.Two angles together make a straight line. One of them is 155°. What is the other angle (in degrees)?
  25. 25.Two angles of a triangle are 25° and 95°. What is the third angle (in degrees)?
  26. 26.Three angles meet at a point. Two of them are 70° and 130°. What is the third angle (in degrees)?
  27. 27.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  28. 28.Three angles meet at a point. Two of them are 120° and 120°. What is the third angle (in degrees)?
  29. 29.Two angles together make a straight line. One of them is 15°. What is the other angle (in degrees)?
  30. 30.Three angles meet at a point. Two of them are 120° and 130°. What is the third angle (in degrees)?
  31. 31.Three angles meet at a point. Two of them are 70° and 80°. What is the third angle (in degrees)?
  32. 32.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?
  33. 33.An angle measures 85°. What kind of angle is it? (a) Right (b) Acute (c) Straight
  34. 34.An angle measures 115°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  35. 35.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  36. 36.Two angles of a triangle are 95° and 40°. What is the third angle (in degrees)?
  37. 37.An angle measures 20°. What kind of angle is it? (a) Straight (b) Right (c) Acute
  38. 38.Two angles together make a straight line. One of them is 120°. What is the other angle (in degrees)?
  39. 39.Two angles of a triangle are 30° and 40°. What is the third angle (in degrees)?
  40. 40.An angle measures 10°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse

Answer key

  1. 170
  2. 180
  3. 50
  4. 120
  5. 130
  6. 70
  7. Obtuse
  8. 75
  9. 200
  10. 130
  11. 10
  12. 60
  13. 90
  14. 40
  15. 220
  16. 35
  17. 150
  18. 55
  19. 145
  20. 65
  21. 135
  22. 85
  23. 210
  24. 25
  25. 60
  26. 160
  27. 60
  28. 120
  29. 165
  30. 110
  31. 210
  32. 40
  33. Acute
  34. Obtuse
  35. 5
  36. 45
  37. Acute
  38. 60
  39. 110
  40. Acute

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