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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 35 · 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 45° and 40°. What is the third angle (in degrees)?
  2. 2.Two angles of a triangle are 65° and 40°. What is the third angle (in degrees)?
  3. 3.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  4. 4.An angle measures 90°. What kind of angle is it? (a) Right (b) Straight (c) Acute
  5. 5.Two angles of a triangle are 75° and 100°. What is the third angle (in degrees)?
  6. 6.A right angle is split into two angles. One of them is 65°. What is the other angle (in degrees)?
  7. 7.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  8. 8.An angle measures 180°. What kind of angle is it? (a) Acute (b) Straight (c) Right
  9. 9.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  10. 10.Two angles of a triangle are 80° and 85°. What is the third angle (in degrees)?
  11. 11.Two angles together make a straight line. One of them is 110°. What is the other angle (in degrees)?
  12. 12.Two angles of a triangle are 45° and 65°. What is the third angle (in degrees)?
  13. 13.What is the smaller angle between the hands of a clock at 2 o'clock (in degrees)?
  14. 14.Two angles together make a straight line. One of them is 95°. What is the other angle (in degrees)?
  15. 15.An angle measures 55°. What kind of angle is it? (a) Obtuse (b) Straight (c) Acute
  16. 16.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  17. 17.An angle measures 65°. What kind of angle is it? (a) Straight (b) Acute (c) Right
  18. 18.Two angles of a triangle are 55° and 75°. What is the third angle (in degrees)?
  19. 19.Two angles of a triangle are 20° and 120°. What is the third angle (in degrees)?
  20. 20.An angle measures 25°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  21. 21.An angle measures 100°. What kind of angle is it? (a) Acute (b) Right (c) Obtuse
  22. 22.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  23. 23.An angle measures 115°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  24. 24.Three angles meet at a point. Two of them are 110° and 190°. What is the third angle (in degrees)?
  25. 25.Three angles meet at a point. Two of them are 110° and 80°. What is the third angle (in degrees)?
  26. 26.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  27. 27.Three angles meet at a point. Two of them are 120° and 180°. What is the third angle (in degrees)?
  28. 28.A right angle is split into two angles. One of them is 70°. What is the other angle (in degrees)?
  29. 29.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  30. 30.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  31. 31.Two angles together make a straight line. One of them is 115°. What is the other angle (in degrees)?
  32. 32.Two angles of a triangle are 60° and 70°. What is the third angle (in degrees)?
  33. 33.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  34. 34.Two angles together make a straight line. One of them is 40°. 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.Two angles of a triangle are 25° and 115°. What is the third angle (in degrees)?
  37. 37.Two angles together make a straight line. One of them is 170°. What is the other angle (in degrees)?
  38. 38.Two angles of a triangle are 75° and 20°. What is the third angle (in degrees)?
  39. 39.Two angles together make a straight line. One of them is 160°. What is the other angle (in degrees)?
  40. 40.Two angles of a triangle are 85° and 45°. What is the third angle (in degrees)?

Answer key

  1. 95
  2. 75
  3. 80
  4. Right
  5. 5
  6. 25
  7. 5
  8. Straight
  9. 180
  10. 15
  11. 70
  12. 70
  13. 60
  14. 85
  15. Acute
  16. 75
  17. Acute
  18. 50
  19. 40
  20. Acute
  21. Obtuse
  22. 120
  23. Obtuse
  24. 60
  25. 170
  26. 60
  27. 60
  28. 20
  29. 150
  30. 90
  31. 65
  32. 50
  33. 90
  34. 140
  35. 30
  36. 40
  37. 10
  38. 85
  39. 20
  40. 50

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