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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 799 · 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: t/2 + t/4 = 3. What is t?
  2. 2.Solve: 3m + 10 = 2m + 15. What is m?
  3. 3.The sum of three consecutive whole numbers is 33. What is the smallest of them?
  4. 4.Solve: p/6 + p/2 = 4. What is p?
  5. 5.The sum of four consecutive whole numbers is 66. What is the smallest of them?
  6. 6.Solve: x/5 + x/3 = 8. What is x?
  7. 7.Solve: 6(x − 2) = x + 23. What is x?
  8. 8.A father is 9 years older than his son. In 4 years, the father will be twice as old as his son. How old is the son now?
  9. 9.The length of a rectangle is 2 cm more than its width. Its perimeter is 16 cm. What is its width (in cm)?
  10. 10.Solve: 5m + 5 = 2m + 41. What is m?
  11. 11.Solve: n/4 + n/5 = 63. What is n?
  12. 12.Solve: 6y + 5 = 2y + 21. What is y?
  13. 13.Solve: 4(t − 4) = 2t + 18. What is t?
  14. 14.Solve: x/3 + x/4 = 42. What is x?
  15. 15.The length of a rectangle is 6 cm more than its width. Its perimeter is 56 cm. What is its width (in cm)?
  16. 16.Solve: 5m + 3 = 2m + 6. What is m?
  17. 17.The sum of two consecutive whole numbers is 99. What is the largest of them?
  18. 18.Solve: 5y + 4 = y + 28. What is y?
  19. 19.The length of a rectangle is 14 cm more than its width. Its perimeter is 144 cm. What is its width (in cm)?
  20. 20.The length of a rectangle is 13 cm more than its width. Its perimeter is 70 cm. What is its width (in cm)?
  21. 21.Solve: 5(x − 3) = 3x + 7. What is x?
  22. 22.Solve: 5m + 15 = 4m + 21. What is m?
  23. 23.Solve: m/4 + m/3 = 35. What is m?
  24. 24.A father is 14 years older than his son. In 6 years, the father will be twice as old as his son. How old is the son now?
  25. 25.The length of a rectangle is 12 cm more than its width. Its perimeter is 48 cm. What is its width (in cm)?
  26. 26.Solve: m/6 + m/2 = 16. What is m?
  27. 27.Solve: 8y + 11 = 4y + 19. What is y?
  28. 28.The length of a rectangle is 3 cm more than its width. Its perimeter is 18 cm. What is its width (in cm)?
  29. 29.Solve: x/4 + x/2 = 21. What is x?
  30. 30.Solve: p/2 + p/4 = 3. What is p?
  31. 31.Solve: y/3 + y/5 = 56. What is y?
  32. 32.A father is 21 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?
  33. 33.A father is 11 years older than his son. In 7 years, the father will be twice as old as his son. How old is the son now?
  34. 34.Solve: y/3 + y/5 = 64. What is y?
  35. 35.The sum of four consecutive whole numbers is 242. What is the smallest of them?
  36. 36.The length of a rectangle is 1 cm more than its width. Its perimeter is 18 cm. What is its width (in cm)?
  37. 37.Solve: 7n + 6 = 6n + 13. What is n?
  38. 38.Solve: y/5 + y/2 = 56. What is y?
  39. 39.The length of a rectangle is 4 cm more than its width. Its perimeter is 20 cm. What is its width (in cm)?
  40. 40.The sum of three consecutive whole numbers is 105. What is the largest of them?

Answer key

  1. 4
  2. 5
  3. 10
  4. 6
  5. 15
  6. 15
  7. 7
  8. 5
  9. 3
  10. 12
  11. 140
  12. 4
  13. 17
  14. 72
  15. 11
  16. 1
  17. 50
  18. 6
  19. 29
  20. 11
  21. 11
  22. 6
  23. 60
  24. 8
  25. 6
  26. 24
  27. 2
  28. 3
  29. 28
  30. 4
  31. 105
  32. 3
  33. 4
  34. 120
  35. 59
  36. 4
  37. 7
  38. 80
  39. 3
  40. 36

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