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Solve for x: angles on a straight line

Year 8 maths · Fieldbook Learning

Name ______________________ Date __________

Angles on a straight line add to 180°. Write an equation and solve for x.

  1. Two angles on a straight line measure (2x + 25)° and (4x − 25)°. Find x.
  2. Two angles on a straight line measure (4x − 6)° and (5x − 39)°. Find x.
  3. Two angles on a straight line measure (2x + 30)° and (4x + 30)°. Find x.
  4. Two angles on a straight line measure (x + 8)° and (5x + 52)°. Find x.
  5. Two angles on a straight line measure (4x + 26)° and (4x + 10)°. Find x.
  6. Two angles on a straight line measure (x − 3)° and (5x + 15)°. Find x.
  7. Two angles on a straight line measure (x + 2)° and (5x + 58)°. Find x.
  8. Two angles on a straight line measure (5x + 7)° and (3x − 51)°. Find x.
  9. Two angles on a straight line measure (4x + 17)° and (5x − 26)°. Find x.
  10. Two angles on a straight line measure (x − 2)° and (3x + 50)°. Find x.
  11. Two angles on a straight line measure (4x + 28)° and (x + 22)°. Find x.
  12. Two angles on a straight line measure (5x + 22)° and (4x − 13)°. Find x.
  13. Two angles on a straight line measure (3x + 30)° and (5x − 50)°. Find x.
  14. Two angles on a straight line measure (5x − 9)° and (2x − 14)°. Find x.
  15. Two angles on a straight line measure (2x + 10)° and (5x + 44)°. Find x.
  16. Two angles on a straight line measure (x + 1)° and (4x + 19)°. Find x.
  17. Two angles on a straight line measure (x + 7)° and (5x + 29)°. Find x.
  18. Two angles on a straight line measure (x + 26)° and (3x − 18)°. Find x.
  19. Two angles on a straight line measure (2x + 19)° and (x + 50)°. Find x.
  20. Two angles on a straight line measure (2x + 24)° and (2x + 16)°. Find x.
More free practice: fieldbooklearning.com/au/practice/year-8/solve-for-x-angles-on-a-straight-line/

Play it as a quiz game

20 of these questions as multiple choice, with near-miss wrong answers, ready for Kahoot or Blooket.

  1. Download the game's own question template: in Kahoot, Add question → Import spreadsheet; in Blooket, Create a set → Spreadsheet import.
  2. Click the matching button below, then click the first empty question row of the template and paste.
  3. Save the template (Kahoot needs .xlsx, Blooket .csv) and upload it.
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Answer key: Solve for x: angles on a straight line

  1. 30
  2. 25
  3. 20
  4. 20
  5. 18
  6. 28
  7. 20
  8. 28
  9. 21
  10. 33
  11. 26
  12. 19
  13. 25
  14. 29
  15. 18
  16. 32
  17. 24
  18. 43
  19. 37
  20. 35