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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 248 · 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 25° and 110°. What is the third angle (in degrees)?
  2. 2.A right angle is split into two angles. One of them is 70°. What is the other angle (in degrees)?
  3. 3.A right angle is split into two angles. One of them is 25°. What is the other angle (in degrees)?
  4. 4.Two angles of a triangle are 30° and 105°. What is the third angle (in degrees)?
  5. 5.Two angles together make a straight line. One of them is 120°. What is the other angle (in degrees)?
  6. 6.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  7. 7.An angle measures 95°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  8. 8.Two angles of a triangle are 50° and 75°. What is the third angle (in degrees)?
  9. 9.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  10. 10.An angle measures 90°. What kind of angle is it? (a) Obtuse (b) Straight (c) Right
  11. 11.Two angles of a triangle are 40° and 55°. What is the third angle (in degrees)?
  12. 12.An angle measures 180°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  13. 13.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  14. 14.Three angles meet at a point. Two of them are 130° and 80°. What is the third angle (in degrees)?
  15. 15.Three angles meet at a point. Two of them are 110° and 170°. What is the third angle (in degrees)?
  16. 16.Two angles of a triangle are 65° and 100°. What is the third angle (in degrees)?
  17. 17.Two angles together make a straight line. One of them is 165°. What is the other angle (in degrees)?
  18. 18.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  19. 19.Three angles meet at a point. Two of them are 140° and 150°. What is the third angle (in degrees)?
  20. 20.An angle measures 155°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  21. 21.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  22. 22.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?
  23. 23.Three angles meet at a point. Two of them are 100° and 180°. What is the third angle (in degrees)?
  24. 24.An angle measures 110°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  25. 25.Two angles of a triangle are 70° and 40°. What is the third angle (in degrees)?
  26. 26.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  27. 27.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  28. 28.Two angles together make a straight line. One of them is 65°. What is the other angle (in degrees)?
  29. 29.Two angles of a triangle are 20° and 145°. What is the third angle (in degrees)?
  30. 30.Three angles meet at a point. Two of them are 80° and 60°. What is the third angle (in degrees)?
  31. 31.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  32. 32.Two angles together make a straight line. One of them is 70°. What is the other angle (in degrees)?
  33. 33.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  34. 34.An angle measures 115°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  35. 35.Three angles meet at a point. Two of them are 110° and 90°. What is the third angle (in degrees)?
  36. 36.A right angle is split into two angles. One of them is 30°. What is the other angle (in degrees)?
  37. 37.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  38. 38.Two angles together make a straight line. One of them is 155°. What is the other angle (in degrees)?
  39. 39.An angle measures 65°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  40. 40.Two angles of a triangle are 25° and 115°. What is the third angle (in degrees)?

Answer key

  1. 45
  2. 20
  3. 65
  4. 45
  5. 60
  6. 180
  7. Obtuse
  8. 55
  9. 150
  10. Right
  11. 85
  12. Straight
  13. 30
  14. 150
  15. 80
  16. 15
  17. 15
  18. 150
  19. 70
  20. Obtuse
  21. 50
  22. 40
  23. 80
  24. Obtuse
  25. 70
  26. 25
  27. 90
  28. 115
  29. 15
  30. 220
  31. 60
  32. 110
  33. 30
  34. Obtuse
  35. 160
  36. 60
  37. 75
  38. 25
  39. Acute
  40. 40

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