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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 244 · 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: 7n + 4 = 4n + 49. What is n?
  2. 2.Solve: 3(t − 3) = t + 13. What is t?
  3. 3.The length of a rectangle is 6 cm more than its width. Its perimeter is 100 cm. What is its width (in cm)?
  4. 4.Solve: n/5 + n/2 = 7. What is n?
  5. 5.A father is 27 years older than his son. In 5 years, the father will be four times as old as his son. How old is the son now?
  6. 6.A father is 14 years older than his son. In 7 years, the father will be twice as old as his son. How old is the son now?
  7. 7.Solve: 5t + 13 = t + 25. What is t?
  8. 8.The length of a rectangle is 7 cm more than its width. Its perimeter is 90 cm. What is its width (in cm)?
  9. 9.Solve: x/2 + x/6 = 28. What is x?
  10. 10.Solve: 7m + 17 = 5m + 39. What is m?
  11. 11.Solve: 8m + 17 = 7m + 31. What is m?
  12. 12.The length of a rectangle is 11 cm more than its width. Its perimeter is 50 cm. What is its width (in cm)?
  13. 13.Solve: 7t + 3 = 2t + 78. What is t?
  14. 14.Solve: 6x + 5 = 5x + 16. What is x?
  15. 15.Solve: 5(n − 2) = 4n + 5. What is n?
  16. 16.Solve: 4y + 10 = 3y + 24. What is y?
  17. 17.The length of a rectangle is 10 cm more than its width. Its perimeter is 60 cm. What is its width (in cm)?
  18. 18.Solve: 8p + 2 = 5p + 41. What is p?
  19. 19.A father is 14 years older than his son. In 2 years, the father will be twice as old as his son. How old is the son now?
  20. 20.Solve: n/4 + n/5 = 27. What is n?
  21. 21.The sum of four consecutive whole numbers is 66. What is the largest of them?
  22. 22.Solve: 6(y − 1) = 4y + 24. What is y?
  23. 23.Solve: y/3 + y/2 = 5. What is y?
  24. 24.Solve: 5y + 13 = 4y + 18. What is y?
  25. 25.Solve: x/2 + x/4 = 18. What is x?
  26. 26.Solve: 7t + 14 = 5t + 18. What is t?
  27. 27.The length of a rectangle is 2 cm more than its width. Its perimeter is 20 cm. What is its width (in cm)?
  28. 28.The sum of two consecutive whole numbers is 79. What is the largest of them?
  29. 29.Solve: 5(m − 5) = m + 35. What is m?
  30. 30.Solve: 7y + 14 = y + 38. What is y?
  31. 31.The sum of four consecutive whole numbers is 82. What is the largest of them?
  32. 32.Solve: 6(y − 4) = 5y + 12. What is y?
  33. 33.The sum of three consecutive whole numbers is 93. What is the smallest of them?
  34. 34.A father is 30 years older than his son. In 1 year, the father will be four times as old as his son. How old is the son now?
  35. 35.The length of a rectangle is 6 cm more than its width. Its perimeter is 92 cm. What is its width (in cm)?
  36. 36.The sum of four consecutive whole numbers is 78. What is the largest of them?
  37. 37.A father is 12 years older than his son. In 1 year, the father will be three times as old as his son. How old is the son now?
  38. 38.Solve: y/4 + y/5 = 63. What is y?
  39. 39.A father is 28 years older than his son. In 7 years, the father will be three times as old as his son. How old is the son now?
  40. 40.Solve: p/5 + p/4 = 72. What is p?

Answer key

  1. 15
  2. 11
  3. 22
  4. 10
  5. 4
  6. 7
  7. 3
  8. 19
  9. 42
  10. 11
  11. 14
  12. 7
  13. 15
  14. 11
  15. 15
  16. 14
  17. 10
  18. 13
  19. 12
  20. 60
  21. 18
  22. 15
  23. 6
  24. 5
  25. 24
  26. 2
  27. 4
  28. 40
  29. 15
  30. 4
  31. 22
  32. 36
  33. 30
  34. 9
  35. 20
  36. 21
  37. 5
  38. 140
  39. 7
  40. 160

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