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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 108 · 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: p/2 + p/4 = 6. What is p?
  2. 2.Solve: 5(n − 3) = 2n + 24. What is n?
  3. 3.The sum of three consecutive whole numbers is 156. What is the largest of them?
  4. 4.Solve: m/2 + m/5 = 56. What is m?
  5. 5.Solve: 9n + 1 = n + 41. What is n?
  6. 6.Solve: 9m + 7 = 4m + 82. What is m?
  7. 7.The length of a rectangle is 10 cm more than its width. Its perimeter is 56 cm. What is its width (in cm)?
  8. 8.Solve: 9n + 14 = 3n + 56. What is n?
  9. 9.The sum of two consecutive whole numbers is 41. What is the smallest of them?
  10. 10.The sum of two consecutive whole numbers is 99. What is the smallest of them?
  11. 11.Solve: x/4 + x/2 = 12. What is x?
  12. 12.Solve: 8t + 15 = 4t + 71. What is t?
  13. 13.Solve: n/4 + n/6 = 20. What is n?
  14. 14.A father is 33 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?
  15. 15.The sum of two consecutive whole numbers is 47. What is the smallest of them?
  16. 16.A father is 18 years older than his son. In 8 years, the father will be twice as old as his son. How old is the son now?
  17. 17.Solve: 3(y − 4) = y + 16. What is y?
  18. 18.Solve: 3(y − 2) = y + 2. What is y?
  19. 19.The sum of four consecutive whole numbers is 54. What is the smallest of them?
  20. 20.Solve: 6(n − 1) = 2n + 50. What is n?
  21. 21.Solve: 9y + 15 = 7y + 29. What is y?
  22. 22.Solve: m/4 + m/6 = 5. What is m?
  23. 23.Solve: t/2 + t/5 = 21. What is t?
  24. 24.Solve: 6y + 11 = 4y + 25. What is y?
  25. 25.Solve: 9m + 14 = 4m + 89. What is m?
  26. 26.A father is 13 years older than his son. In 8 years, the father will be twice as old as his son. How old is the son now?
  27. 27.The sum of two consecutive whole numbers is 25. What is the largest of them?
  28. 28.The length of a rectangle is 5 cm more than its width. Its perimeter is 126 cm. What is its width (in cm)?
  29. 29.Solve: 7t + 1 = 3t + 25. What is t?
  30. 30.A father is 12 years older than his son. In 2 years, the father will be four times as old as his son. How old is the son now?
  31. 31.The sum of two consecutive whole numbers is 19. What is the smallest of them?
  32. 32.A father is 34 years older than his son. In 6 years, the father will be three times as old as his son. How old is the son now?
  33. 33.Solve: y/5 + y/3 = 56. What is y?
  34. 34.A father is 14 years older than his son. In 8 years, the father will be twice as old as his son. How old is the son now?
  35. 35.Solve: n/4 + n/2 = 6. What is n?
  36. 36.A father is 12 years older than his son. In 8 years, the father will be twice as old as his son. How old is the son now?
  37. 37.The length of a rectangle is 2 cm more than its width. Its perimeter is 64 cm. What is its width (in cm)?
  38. 38.Solve: 6(p − 1) = 2p + 10. What is p?
  39. 39.Solve: 5t + 16 = 2t + 19. What is t?
  40. 40.Solve: 5m + 7 = m + 39. What is m?

Answer key

  1. 8
  2. 13
  3. 53
  4. 80
  5. 5
  6. 15
  7. 9
  8. 7
  9. 20
  10. 49
  11. 16
  12. 14
  13. 48
  14. 7
  15. 23
  16. 10
  17. 14
  18. 4
  19. 12
  20. 14
  21. 7
  22. 12
  23. 30
  24. 7
  25. 15
  26. 5
  27. 13
  28. 29
  29. 6
  30. 2
  31. 9
  32. 11
  33. 105
  34. 6
  35. 8
  36. 4
  37. 15
  38. 4
  39. 1
  40. 8

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