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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 402 · 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 45°. What is the other angle (in degrees)?
  2. 2.Three angles meet at a point. Two of them are 50° and 50°. What is the third angle (in degrees)?
  3. 3.Two angles of a triangle are 70° and 105°. What is the third angle (in degrees)?
  4. 4.An angle measures 180°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  5. 5.Three angles meet at a point. Two of them are 110° and 70°. What is the third angle (in degrees)?
  6. 6.Two angles together make a straight line. One of them is 105°. What is the other angle (in degrees)?
  7. 7.An angle measures 50°. What kind of angle is it? (a) Straight (b) Right (c) Acute
  8. 8.Three angles meet at a point. Two of them are 50° and 190°. What is the third angle (in degrees)?
  9. 9.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  10. 10.Three angles meet at a point. Two of them are 140° and 60°. What is the third angle (in degrees)?
  11. 11.Two angles of a triangle are 80° and 45°. 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.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  14. 14.Two angles together make a straight line. One of them is 15°. What is the other angle (in degrees)?
  15. 15.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  16. 16.Three angles meet at a point. Two of them are 110° and 90°. What is the third angle (in degrees)?
  17. 17.An angle measures 90°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  18. 18.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  19. 19.An angle measures 40°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  20. 20.Two angles of a triangle are 50° and 60°. What is the third angle (in degrees)?
  21. 21.Two angles together make a straight line. One of them is 35°. What is the other angle (in degrees)?
  22. 22.An angle measures 105°. What kind of angle is it? (a) Obtuse (b) Acute (c) Straight
  23. 23.Three angles meet at a point. Two of them are 60° and 240°. What is the third angle (in degrees)?
  24. 24.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  25. 25.Two angles together make a straight line. One of them is 70°. What is the other angle (in degrees)?
  26. 26.Two angles of a triangle are 75° and 45°. What is the third angle (in degrees)?
  27. 27.Three angles meet at a point. Two of them are 140° and 120°. What is the third angle (in degrees)?
  28. 28.Two angles of a triangle are 40° and 125°. What is the third angle (in degrees)?
  29. 29.Two angles of a triangle are 25° and 55°. What is the third angle (in degrees)?
  30. 30.Two angles of a triangle are 25° and 130°. What is the third angle (in degrees)?
  31. 31.Two angles of a triangle are 45° and 20°. What is the third angle (in degrees)?
  32. 32.An angle measures 35°. 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 8 o'clock (in degrees)?
  34. 34.Two angles of a triangle are 80° and 35°. What is the third angle (in degrees)?
  35. 35.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  36. 36.Two angles of a triangle are 55° and 90°. What is the third angle (in degrees)?
  37. 37.An angle measures 15°. What kind of angle is it? (a) Acute (b) Straight (c) Right
  38. 38.Two angles of a triangle are 45° and 30°. What is the third angle (in degrees)?
  39. 39.Two angles together make a straight line. One of them is 85°. What is the other angle (in degrees)?
  40. 40.Three angles meet at a point. Two of them are 50° and 60°. What is the third angle (in degrees)?

Answer key

  1. 45
  2. 260
  3. 5
  4. Straight
  5. 180
  6. 75
  7. Acute
  8. 120
  9. 60
  10. 160
  11. 55
  12. 170
  13. 70
  14. 165
  15. 5
  16. 160
  17. Right
  18. 140
  19. Acute
  20. 70
  21. 145
  22. Obtuse
  23. 60
  24. 90
  25. 110
  26. 60
  27. 100
  28. 15
  29. 100
  30. 25
  31. 115
  32. Acute
  33. 120
  34. 65
  35. 30
  36. 35
  37. Acute
  38. 105
  39. 95
  40. 250

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