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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 974 · 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: n/5 + n/2 = 35. What is n?
  2. 2.A father is 28 years older than his son. In 5 years, the father will be three times as old as his son. How old is the son now?
  3. 3.The length of a rectangle is 4 cm more than its width. Its perimeter is 84 cm. What is its width (in cm)?
  4. 4.The length of a rectangle is 13 cm more than its width. Its perimeter is 94 cm. What is its width (in cm)?
  5. 5.Solve: 5n + 20 = n + 72. What is n?
  6. 6.The sum of four consecutive whole numbers is 230. What is the largest of them?
  7. 7.Solve: t/4 + t/5 = 36. What is t?
  8. 8.Solve: 7t + 7 = 2t + 82. What is t?
  9. 9.The sum of four consecutive whole numbers is 142. What is the smallest of them?
  10. 10.Solve: 4(y − 4) = y + 35. What is y?
  11. 11.A father is 28 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?
  12. 12.The sum of four consecutive whole numbers is 42. What is the largest of them?
  13. 13.Solve: 6m + 5 = 2m + 29. What is m?
  14. 14.The length of a rectangle is 7 cm more than its width. Its perimeter is 42 cm. What is its width (in cm)?
  15. 15.A father is 36 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?
  16. 16.Solve: x/3 + x/2 = 25. What is x?
  17. 17.The sum of two consecutive whole numbers is 89. What is the largest of them?
  18. 18.Solve: 3(t − 3) = t + 15. What is t?
  19. 19.The sum of two consecutive whole numbers is 37. What is the largest of them?
  20. 20.Solve: 6(t − 2) = t + 33. What is t?
  21. 21.A father is 26 years older than his son. In 2 years, the father will be three times as old as his son. How old is the son now?
  22. 22.The sum of four consecutive whole numbers is 134. What is the smallest of them?
  23. 23.The length of a rectangle is 10 cm more than its width. Its perimeter is 36 cm. What is its width (in cm)?
  24. 24.Solve: 5x + 8 = 2x + 29. What is x?
  25. 25.Solve: 9m + 5 = 7m + 15. What is m?
  26. 26.Solve: 4(y − 1) = 2y + 22. What is y?
  27. 27.Solve: 7n + 17 = n + 71. What is n?
  28. 28.Solve: t/2 + t/3 = 40. What is t?
  29. 29.Solve: 8y + 20 = 7y + 30. What is y?
  30. 30.Solve: y/2 + y/3 = 25. What is y?
  31. 31.Solve: x/2 + x/4 = 12. What is x?
  32. 32.A father is 10 years older than his son. In 8 years, the father will be twice as old as his son. How old is the son now?
  33. 33.Solve: 6(n − 3) = 5n + 2. What is n?
  34. 34.Solve: 3(m − 1) = 2m + 7. What is m?
  35. 35.Solve: n/2 + n/5 = 14. What is n?
  36. 36.A father is 39 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?
  37. 37.The sum of two consecutive whole numbers is 99. What is the largest of them?
  38. 38.Solve: 6(x − 2) = 5x + 5. What is x?
  39. 39.The sum of two consecutive whole numbers is 113. What is the smallest of them?
  40. 40.A father is 13 years older than his son. In 6 years, the father will be twice as old as his son. How old is the son now?

Answer key

  1. 50
  2. 9
  3. 19
  4. 17
  5. 13
  6. 59
  7. 80
  8. 15
  9. 34
  10. 17
  11. 8
  12. 12
  13. 6
  14. 7
  15. 7
  16. 30
  17. 45
  18. 12
  19. 19
  20. 9
  21. 11
  22. 32
  23. 4
  24. 7
  25. 5
  26. 13
  27. 9
  28. 48
  29. 10
  30. 30
  31. 16
  32. 2
  33. 20
  34. 10
  35. 20
  36. 11
  37. 50
  38. 17
  39. 56
  40. 7

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