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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 811 · 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.The sum of two consecutive whole numbers is 11. What is the smallest of them?
  2. 2.The sum of two consecutive whole numbers is 25. What is the smallest of them?
  3. 3.A father is 7 years older than his son. In 1 year, the father will be twice as old as his son. How old is the son now?
  4. 4.Solve: y/6 + y/2 = 20. What is y?
  5. 5.A father is 39 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?
  6. 6.Solve: 6x + 11 = 3x + 35. What is x?
  7. 7.The length of a rectangle is 10 cm more than its width. Its perimeter is 60 cm. What is its width (in cm)?
  8. 8.A father is 30 years older than his son. In 7 years, the father will be four times as old as his son. How old is the son now?
  9. 9.The sum of four consecutive whole numbers is 50. What is the smallest of them?
  10. 10.A father is 15 years older than his son. In 4 years, the father will be twice as old as his son. How old is the son now?
  11. 11.Solve: x/5 + x/2 = 7. What is x?
  12. 12.Solve: 7n + 18 = 4n + 54. What is n?
  13. 13.Solve: x/5 + x/6 = 88. What is x?
  14. 14.Solve: 3y + 7 = 2y + 22. What is y?
  15. 15.The sum of three consecutive whole numbers is 78. What is the smallest of them?
  16. 16.Solve: 9m + 6 = 4m + 81. What is m?
  17. 17.The length of a rectangle is 12 cm more than its width. Its perimeter is 136 cm. What is its width (in cm)?
  18. 18.Solve: 5(t − 1) = t + 51. What is t?
  19. 19.Solve: 3(y − 1) = y + 11. What is y?
  20. 20.The length of a rectangle is 13 cm more than its width. Its perimeter is 42 cm. What is its width (in cm)?
  21. 21.The length of a rectangle is 8 cm more than its width. Its perimeter is 96 cm. What is its width (in cm)?
  22. 22.The sum of four consecutive whole numbers is 78. What is the largest of them?
  23. 23.Solve: 5y + 14 = 3y + 40. What is y?
  24. 24.Solve: 6(p − 2) = 5p + 6. What is p?
  25. 25.Solve: 6n + 18 = 5n + 24. What is n?
  26. 26.Solve: 5(p − 3) = 2p + 33. What is p?
  27. 27.Solve: 7y + 8 = y + 32. What is y?
  28. 28.The length of a rectangle is 13 cm more than its width. Its perimeter is 50 cm. What is its width (in cm)?
  29. 29.Solve: 4(y − 3) = y + 3. What is y?
  30. 30.The length of a rectangle is 12 cm more than its width. Its perimeter is 84 cm. What is its width (in cm)?
  31. 31.Solve: 9t + 10 = 5t + 50. What is t?
  32. 32.A father is 4 years older than his son. In 2 years, the father will be twice as old as his son. How old is the son now?
  33. 33.Solve: x/6 + x/4 = 25. What is x?
  34. 34.The length of a rectangle is 1 cm more than its width. Its perimeter is 46 cm. What is its width (in cm)?
  35. 35.Solve: 7n + 17 = 3n + 33. What is n?
  36. 36.Solve: x/4 + x/6 = 10. What is x?
  37. 37.Solve: 5(x − 4) = x + 44. What is x?
  38. 38.The length of a rectangle is 12 cm more than its width. Its perimeter is 48 cm. What is its width (in cm)?
  39. 39.The sum of three consecutive whole numbers is 63. What is the smallest of them?
  40. 40.Solve: 3(n − 2) = n + 8. What is n?

Answer key

  1. 5
  2. 12
  3. 6
  4. 30
  5. 10
  6. 8
  7. 10
  8. 3
  9. 11
  10. 11
  11. 10
  12. 12
  13. 240
  14. 15
  15. 25
  16. 15
  17. 28
  18. 14
  19. 7
  20. 4
  21. 20
  22. 21
  23. 13
  24. 18
  25. 6
  26. 16
  27. 4
  28. 6
  29. 5
  30. 15
  31. 10
  32. 2
  33. 60
  34. 11
  35. 4
  36. 24
  37. 16
  38. 6
  39. 20
  40. 7

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