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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 423 · 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 25°. What is the other angle (in degrees)?
  2. 2.A right angle is split into two angles. One of them is 85°. What is the other angle (in degrees)?
  3. 3.Two angles of a triangle are 55° and 115°. What is the third angle (in degrees)?
  4. 4.Two angles of a triangle are 25° and 100°. What is the third angle (in degrees)?
  5. 5.Two angles together make a straight line. One of them is 140°. What is the other angle (in degrees)?
  6. 6.An angle measures 110°. What kind of angle is it? (a) Obtuse (b) Straight (c) Right
  7. 7.An angle measures 90°. What kind of angle is it? (a) Straight (b) Right (c) Obtuse
  8. 8.What is the smaller angle between the hands of a clock at 10 o'clock (in degrees)?
  9. 9.What is the smaller angle between the hands of a clock at 11 o'clock (in degrees)?
  10. 10.Two angles together make a straight line. One of them is 40°. What is the other angle (in degrees)?
  11. 11.A right angle is split into two angles. One of them is 30°. What is the other angle (in degrees)?
  12. 12.Two angles together make a straight line. One of them is 90°. What is the other angle (in degrees)?
  13. 13.An angle measures 180°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse
  14. 14.Two angles of a triangle are 20° and 100°. What is the third angle (in degrees)?
  15. 15.Two angles of a triangle are 20° and 70°. What is the third angle (in degrees)?
  16. 16.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  17. 17.Two angles together make a straight line. One of them is 85°. What is the other angle (in degrees)?
  18. 18.Two angles of a triangle are 20° and 130°. What is the third angle (in degrees)?
  19. 19.Two angles together make a straight line. One of them is 130°. What is the other angle (in degrees)?
  20. 20.An angle measures 95°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  21. 21.A right angle is split into two angles. One of them is 70°. What is the other angle (in degrees)?
  22. 22.Two angles of a triangle are 20° and 85°. What is the third angle (in degrees)?
  23. 23.Two angles together make a straight line. One of them is 20°. What is the other angle (in degrees)?
  24. 24.An angle measures 170°. What kind of angle is it? (a) Obtuse (b) Right (c) Acute
  25. 25.What is the smaller angle between the hands of a clock at 9 o'clock (in degrees)?
  26. 26.Three angles meet at a point. Two of them are 150° and 110°. What is the third angle (in degrees)?
  27. 27.An angle measures 80°. What kind of angle is it? (a) Straight (b) Acute (c) Obtuse
  28. 28.Three angles meet at a point. Two of them are 130° and 70°. What is the third angle (in degrees)?
  29. 29.A right angle is split into two angles. One of them is 40°. What is the other angle (in degrees)?
  30. 30.An angle measures 10°. What kind of angle is it? (a) Right (b) Straight (c) Acute
  31. 31.Two angles of a triangle are 50° and 70°. What is the third angle (in degrees)?
  32. 32.A right angle is split into two angles. One of them is 50°. What is the other angle (in degrees)?
  33. 33.An angle measures 55°. What kind of angle is it? (a) Obtuse (b) Acute (c) Right
  34. 34.Two angles of a triangle are 75° and 30°. What is the third angle (in degrees)?
  35. 35.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  36. 36.Two angles together make a straight line. One of them is 50°. What is the other angle (in degrees)?
  37. 37.An angle measures 60°. What kind of angle is it? (a) Obtuse (b) Acute (c) Straight
  38. 38.Two angles together make a straight line. One of them is 150°. What is the other angle (in degrees)?
  39. 39.An angle measures 100°. What kind of angle is it? (a) Acute (b) Straight (c) Obtuse
  40. 40.A right angle is split into two angles. One of them is 20°. What is the other angle (in degrees)?

Answer key

  1. 65
  2. 5
  3. 10
  4. 55
  5. 40
  6. Obtuse
  7. Right
  8. 60
  9. 30
  10. 140
  11. 60
  12. 90
  13. Straight
  14. 60
  15. 90
  16. 75
  17. 95
  18. 30
  19. 50
  20. Obtuse
  21. 20
  22. 75
  23. 160
  24. Obtuse
  25. 90
  26. 100
  27. Acute
  28. 160
  29. 50
  30. Acute
  31. 60
  32. 40
  33. Acute
  34. 75
  35. 90
  36. 130
  37. Acute
  38. 30
  39. Obtuse
  40. 70

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