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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 210 · 40 sums
TalentJR

The method (Letters one side, numbers the other): Open brackets: a(x − b) = ax − ab. Fractions: multiply both sides by the LCM of the denominators — x/3 + x/4 = 14 → 4x + 3x = 168. Move letter terms to one side and numbers to the other (change the sign when a term crosses =), then divide. Word problems: consecutive numbers are n, n + 1, n + 2 …; ages in y years are age + y.

NameDateTime takenScore ___ / 40
  1. 1.Solve: 5(n − 1) = 3n + 1. What is n?
  2. 2.Solve: 4m + 16 = 2m + 18. What is m?
  3. 3.Solve: 4m + 15 = 2m + 35. What is m?
  4. 4.The sum of three consecutive whole numbers is 51. What is the largest of them?
  5. 5.A father is 48 years older than his son. In 6 years, the father will be four times as old as his son. How old is the son now?
  6. 6.Solve: 3(p − 2) = p + 8. What is p?
  7. 7.Solve: 3n + 8 = n + 20. What is n?
  8. 8.Solve: 5(n − 3) = n + 41. What is n?
  9. 9.Solve: 5m + 4 = m + 16. What is m?
  10. 10.Solve: 4(m − 3) = m + 21. What is m?
  11. 11.Solve: p/5 + p/2 = 35. What is p?
  12. 12.Solve: 3(m − 3) = m + 9. What is m?
  13. 13.Solve: 3(y − 4) = 2y + 5. What is y?
  14. 14.Solve: m/6 + m/5 = 55. What is m?
  15. 15.The length of a rectangle is 15 cm more than its width. Its perimeter is 142 cm. What is its width (in cm)?
  16. 16.The sum of four consecutive whole numbers is 230. What is the smallest of them?
  17. 17.Solve: 3y + 4 = y + 30. What is y?
  18. 18.Solve: 9x + 3 = 5x + 7. What is x?
  19. 19.The length of a rectangle is 3 cm more than its width. Its perimeter is 90 cm. What is its width (in cm)?
  20. 20.The length of a rectangle is 5 cm more than its width. Its perimeter is 18 cm. What is its width (in cm)?
  21. 21.Solve: 6(t − 5) = t + 45. What is t?
  22. 22.Solve: y/2 + y/3 = 40. What is y?
  23. 23.Solve: 9t + 16 = 8t + 30. What is t?
  24. 24.A father is 12 years older than his son. In 4 years, the father will be three times as old as his son. How old is the son now?
  25. 25.The length of a rectangle is 9 cm more than its width. Its perimeter is 50 cm. What is its width (in cm)?
  26. 26.Solve: m/5 + m/3 = 64. What is m?
  27. 27.A father is 39 years older than his son. In 4 years, the father will be four times as old as his son. How old is the son now?
  28. 28.The length of a rectangle is 4 cm more than its width. Its perimeter is 28 cm. What is its width (in cm)?
  29. 29.Solve: 5x + 18 = x + 46. What is x?
  30. 30.Solve: x/3 + x/2 = 15. What is x?
  31. 31.A father is 24 years older than his son. In 3 years, the father will be four times as old as his son. How old is the son now?
  32. 32.The sum of four consecutive whole numbers is 102. What is the largest of them?
  33. 33.The sum of two consecutive whole numbers is 81. What is the smallest of them?
  34. 34.The length of a rectangle is 1 cm more than its width. Its perimeter is 118 cm. What is its width (in cm)?
  35. 35.Solve: 9t + 7 = 6t + 10. What is t?
  36. 36.Solve: 6n + 3 = 5n + 8. What is n?
  37. 37.Solve: 6n + 13 = 2n + 49. What is n?
  38. 38.Solve: 4p + 5 = 2p + 9. What is p?
  39. 39.The length of a rectangle is 5 cm more than its width. Its perimeter is 74 cm. What is its width (in cm)?
  40. 40.Solve: 6x + 14 = 5x + 17. What is x?

Answer key

  1. 3
  2. 1
  3. 10
  4. 18
  5. 10
  6. 7
  7. 6
  8. 14
  9. 3
  10. 11
  11. 50
  12. 9
  13. 17
  14. 150
  15. 28
  16. 56
  17. 13
  18. 1
  19. 21
  20. 2
  21. 15
  22. 48
  23. 14
  24. 2
  25. 8
  26. 120
  27. 9
  28. 5
  29. 7
  30. 18
  31. 5
  32. 27
  33. 40
  34. 29
  35. 1
  36. 5
  37. 9
  38. 2
  39. 16
  40. 3

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