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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 684 · 40 sums
TalentJR

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 25°. What is the other angle (in degrees)?
  2. 2.Two angles together make a straight line. One of them is 120°. What is the other angle (in degrees)?
  3. 3.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?
  4. 4.Two angles of a triangle are 40° and 130°. What is the third angle (in degrees)?
  5. 5.Two angles together make a straight line. One of them is 80°. What is the other angle (in degrees)?
  6. 6.An angle measures 180°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  7. 7.Two angles of a triangle are 40° and 60°. What is the third angle (in degrees)?
  8. 8.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  9. 9.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  10. 10.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  11. 11.Two angles of a triangle are 100° and 75°. What is the third angle (in degrees)?
  12. 12.An angle measures 15°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  13. 13.Three angles meet at a point. Two of them are 140° and 120°. What is the third angle (in degrees)?
  14. 14.An angle measures 135°. What kind of angle is it? (a) Obtuse (b) Straight (c) Right
  15. 15.Two angles together make a straight line. One of them is 150°. What is the other angle (in degrees)?
  16. 16.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  17. 17.Two angles of a triangle are 30° and 20°. What is the third angle (in degrees)?
  18. 18.Two angles together make a straight line. One of them is 125°. What is the other angle (in degrees)?
  19. 19.An angle measures 90°. What kind of angle is it? (a) Straight (b) Acute (c) Right
  20. 20.A right angle is split into two angles. One of them is 5°. 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.Two angles together make a straight line. One of them is 130°. What is the other angle (in degrees)?
  23. 23.An angle measures 60°. What kind of angle is it? (a) Obtuse (b) Straight (c) Acute
  24. 24.Three angles meet at a point. Two of them are 110° and 80°. What is the third angle (in degrees)?
  25. 25.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  26. 26.Two angles of a triangle are 80° and 60°. What is the third angle (in degrees)?
  27. 27.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  28. 28.An angle measures 155°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  29. 29.Two angles of a triangle are 50° and 60°. What is the third angle (in degrees)?
  30. 30.Three angles meet at a point. Two of them are 140° and 80°. What is the third angle (in degrees)?
  31. 31.Two angles together make a straight line. One of them is 55°. What is the other angle (in degrees)?
  32. 32.Two angles together make a straight line. One of them is 85°. What is the other angle (in degrees)?
  33. 33.Two angles together make a straight line. One of them is 135°. What is the other angle (in degrees)?
  34. 34.An angle measures 165°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  35. 35.An angle measures 160°. What kind of angle is it? (a) Obtuse (b) Straight (c) Right
  36. 36.Two angles of a triangle are 40° and 35°. What is the third angle (in degrees)?
  37. 37.What is the smaller angle between the hands of a clock at 1 o'clock (in degrees)?
  38. 38.Two angles together make a straight line. One of them is 10°. What is the other angle (in degrees)?
  39. 39.Two angles of a triangle are 100° and 25°. What is the third angle (in degrees)?
  40. 40.Three angles meet at a point. Two of them are 100° and 90°. What is the third angle (in degrees)?

Answer key

  1. 65
  2. 60
  3. 70
  4. 10
  5. 100
  6. Straight
  7. 80
  8. 80
  9. 35
  10. 90
  11. 5
  12. Acute
  13. 100
  14. Obtuse
  15. 30
  16. 150
  17. 130
  18. 55
  19. Right
  20. 85
  21. 135
  22. 50
  23. Acute
  24. 170
  25. 150
  26. 40
  27. 75
  28. Obtuse
  29. 70
  30. 140
  31. 125
  32. 95
  33. 45
  34. Obtuse
  35. Obtuse
  36. 105
  37. 30
  38. 170
  39. 55
  40. 170

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