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Class 5 Maths Worksheet: Angles

Maths worksheets lesson 39: Angles · Set 251 · 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 60°. What is the other angle (in degrees)?
  2. 2.Three angles meet at a point. Two of them are 120° and 100°. What is the third angle (in degrees)?
  3. 3.Two angles together make a straight line. One of them is 30°. What is the other angle (in degrees)?
  4. 4.Two angles of a triangle are 40° and 20°. What is the third angle (in degrees)?
  5. 5.What is the smaller angle between the hands of a clock at 3 o'clock (in degrees)?
  6. 6.An angle measures 40°. What kind of angle is it? (a) Right (b) Obtuse (c) Acute
  7. 7.What is the smaller angle between the hands of a clock at 5 o'clock (in degrees)?
  8. 8.Three angles meet at a point. Two of them are 120° and 170°. 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 180°. What kind of angle is it? (a) Straight (b) Acute (c) Right
  11. 11.Two angles of a triangle are 55° and 80°. What is the third angle (in degrees)?
  12. 12.Two angles together make a straight line. One of them is 125°. What is the other angle (in degrees)?
  13. 13.Three angles meet at a point. Two of them are 110° and 90°. What is the third angle (in degrees)?
  14. 14.Three angles meet at a point. Two of them are 90° and 60°. What is the third angle (in degrees)?
  15. 15.Two angles of a triangle are 90° and 60°. What is the third angle (in degrees)?
  16. 16.An angle measures 90°. What kind of angle is it? (a) Right (b) Obtuse (c) Straight
  17. 17.Two angles of a triangle are 35° and 55°. What is the third angle (in degrees)?
  18. 18.Two angles together make a straight line. One of them is 45°. What is the other angle (in degrees)?
  19. 19.Three angles meet at a point. Two of them are 110° and 60°. What is the third angle (in degrees)?
  20. 20.An angle measures 55°. What kind of angle is it? (a) Straight (b) Obtuse (c) Acute
  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 of a triangle are 70° and 100°. What is the third angle (in degrees)?
  23. 23.A right angle is split into two angles. One of them is 5°. What is the other angle (in degrees)?
  24. 24.Two angles of a triangle are 50° and 25°. What is the third angle (in degrees)?
  25. 25.Two angles together make a straight line. One of them is 145°. What is the other angle (in degrees)?
  26. 26.A right angle is split into two angles. One of them is 55°. What is the other angle (in degrees)?
  27. 27.Three angles meet at a point. Two of them are 50° and 90°. What is the third angle (in degrees)?
  28. 28.Three angles meet at a point. Two of them are 100° and 170°. What is the third angle (in degrees)?
  29. 29.What is the smaller angle between the hands of a clock at 6 o'clock (in degrees)?
  30. 30.Two angles together make a straight line. One of them is 70°. What is the other angle (in degrees)?
  31. 31.Two angles together make a straight line. One of them is 100°. What is the other angle (in degrees)?
  32. 32.A right angle is split into two angles. One of them is 15°. What is the other angle (in degrees)?
  33. 33.Two angles of a triangle are 70° and 95°. What is the third angle (in degrees)?
  34. 34.What is the smaller angle between the hands of a clock at 8 o'clock (in degrees)?
  35. 35.An angle measures 45°. What kind of angle is it? (a) Acute (b) Obtuse (c) Straight
  36. 36.Three angles meet at a point. Two of them are 130° and 110°. What is the third angle (in degrees)?
  37. 37.Two angles together make a straight line. One of them is 60°. What is the other angle (in degrees)?
  38. 38.Three angles meet at a point. Two of them are 130° and 80°. What is the third angle (in degrees)?
  39. 39.Two angles together make a straight line. One of them is 110°. What is the other angle (in degrees)?
  40. 40.Two angles together make a straight line. One of them is 165°. What is the other angle (in degrees)?

Answer key

  1. 30
  2. 140
  3. 150
  4. 120
  5. 90
  6. Acute
  7. 150
  8. 70
  9. 150
  10. Straight
  11. 45
  12. 55
  13. 160
  14. 210
  15. 30
  16. Right
  17. 90
  18. 135
  19. 190
  20. Acute
  21. 50
  22. 10
  23. 85
  24. 105
  25. 35
  26. 35
  27. 220
  28. 90
  29. 180
  30. 110
  31. 80
  32. 75
  33. 15
  34. 120
  35. Acute
  36. 120
  37. 120
  38. 150
  39. 70
  40. 15

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