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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 521 · 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.An angle measures 50°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  2. 2.An angle measures 15°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  3. 3.A right angle is split into two angles. One of them is 45°. What is the other angle (in degrees)?
  4. 4.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  5. 5.Two angles together make a straight line. One of them is 55°. What is the other angle (in degrees)?
  6. 6.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  7. 7.Two angles together make a straight line. One of them is 80°. What is the other angle (in degrees)?
  8. 8.An angle measures 90°. 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 2 o'clock (in degrees)?
  10. 10.An angle measures 140°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  11. 11.Two angles together make a straight line. One of them is 35°. What is the other angle (in degrees)?
  12. 12.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  13. 13.Two angles of a triangle are 85° and 60°. What is the third angle (in degrees)?
  14. 14.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  15. 15.An angle measures 135°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  16. 16.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  17. 17.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  18. 18.Two angles of a triangle are 20° and 65°. What is the third angle (in degrees)?
  19. 19.An angle measures 180°. What kind of angle is it? (a) Obtuse (b) Acute (c) Straight
  20. 20.Two angles together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  21. 21.A right angle is split into two angles. One of them is 50°. What is the other angle (in degrees)?
  22. 22.Two angles of a triangle are 70° and 70°. What is the third angle (in degrees)?
  23. 23.Three angles meet at a point. Two of them are 140° and 160°. What is the third angle (in degrees)?
  24. 24.Three angles meet at a point. Two of them are 90° and 140°. What is the third angle (in degrees)?
  25. 25.Two angles of a triangle are 55° and 110°. What is the third angle (in degrees)?
  26. 26.A right angle is split into two angles. One of them is 10°. What is the other angle (in degrees)?
  27. 27.What is the smaller angle between the hands of a clock at 7 o'clock (in degrees)?
  28. 28.Two angles of a triangle are 60° and 75°. What is the third angle (in degrees)?
  29. 29.Two angles of a triangle are 45° and 80°. What is the third angle (in degrees)?
  30. 30.An angle measures 70°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  31. 31.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  32. 32.An angle measures 75°. What kind of angle is it? (a) Acute (b) Straight (c) Right
  33. 33.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  34. 34.Two angles together make a straight line. One of them is 90°. What is the other angle (in degrees)?
  35. 35.Two angles of a triangle are 100° and 75°. What is the third angle (in degrees)?
  36. 36.Two angles together make a straight line. One of them is 70°. What is the other angle (in degrees)?
  37. 37.What is the smaller angle between the hands of a clock at 4 o'clock (in degrees)?
  38. 38.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  39. 39.Two angles of a triangle are 55° and 45°. What is the third angle (in degrees)?
  40. 40.An angle measures 25°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse

Answer key

  1. Acute
  2. Acute
  3. 45
  4. 50
  5. 125
  6. 150
  7. 100
  8. Right
  9. 60
  10. Obtuse
  11. 145
  12. 90
  13. 35
  14. 5
  15. Obtuse
  16. 140
  17. 30
  18. 95
  19. Straight
  20. 160
  21. 40
  22. 40
  23. 60
  24. 130
  25. 15
  26. 80
  27. 150
  28. 45
  29. 55
  30. Acute
  31. 90
  32. Acute
  33. 60
  34. 90
  35. 5
  36. 110
  37. 120
  38. 75
  39. 80
  40. Acute

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