← Linear equations in one variable lesson New set →

Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 823 · 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 three consecutive whole numbers is 177. What is the smallest of them?
  2. 2.Solve: m/2 + m/4 = 6. What is m?
  3. 3.The length of a rectangle is 5 cm more than its width. Its perimeter is 118 cm. What is its width (in cm)?
  4. 4.Solve: 7t + 9 = 2t + 79. What is t?
  5. 5.Solve: 9n + 3 = 4n + 78. What is n?
  6. 6.A father is 39 years older than his son. In 6 years, the father will be four times as old as his son. How old is the son now?
  7. 7.The length of a rectangle is 2 cm more than its width. Its perimeter is 68 cm. What is its width (in cm)?
  8. 8.Solve: 5(m − 3) = 3m + 19. What is m?
  9. 9.Solve: 6(m − 5) = 5m + 2. What is m?
  10. 10.Solve: n/2 + n/5 = 7. What is n?
  11. 11.The sum of two consecutive whole numbers is 109. What is the largest of them?
  12. 12.Solve: 6(n − 1) = 4n + 18. What is n?
  13. 13.A father is 22 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?
  14. 14.The sum of three consecutive whole numbers is 51. What is the smallest of them?
  15. 15.Solve: 5x + 18 = 3x + 48. What is x?
  16. 16.Solve: 5m + 20 = 2m + 65. What is m?
  17. 17.Solve: x/2 + x/3 = 15. What is x?
  18. 18.A father is 10 years older than his son. In 5 years, the father will be twice as old as his son. How old is the son now?
  19. 19.Solve: 4(n − 5) = 3n + 6. What is n?
  20. 20.Solve: 6(y − 1) = 3y + 9. What is y?
  21. 21.The length of a rectangle is 1 cm more than its width. Its perimeter is 10 cm. What is its width (in cm)?
  22. 22.The sum of four consecutive whole numbers is 74. What is the largest of them?
  23. 23.Solve: 6(n − 5) = 2n + 50. What is n?
  24. 24.Solve: 9n + 14 = 8n + 28. What is n?
  25. 25.The length of a rectangle is 15 cm more than its width. Its perimeter is 106 cm. What is its width (in cm)?
  26. 26.The sum of three consecutive whole numbers is 21. What is the largest of them?
  27. 27.Solve: 3(x − 2) = 2x + 13. What is x?
  28. 28.Solve: 6t + 18 = t + 53. What is t?
  29. 29.Solve: 3(x − 1) = x + 13. What is x?
  30. 30.Solve: 9t + 17 = 6t + 59. What is t?
  31. 31.Solve: 3x + 6 = x + 26. What is x?
  32. 32.The sum of three consecutive whole numbers is 36. What is the smallest of them?
  33. 33.A father is 21 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?
  34. 34.Solve: x/2 + x/6 = 20. What is x?
  35. 35.The length of a rectangle is 1 cm more than its width. Its perimeter is 34 cm. What is its width (in cm)?
  36. 36.Solve: x/3 + x/2 = 5. What is x?
  37. 37.Solve: 6(y − 1) = 2y + 34. What is y?
  38. 38.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?
  39. 39.A father is 30 years older than his son. In 8 years, the father will be three times as old as his son. How old is the son now?
  40. 40.A father is 36 years older than his son. In 6 years, the father will be four times as old as his son. How old is the son now?

Answer key

  1. 58
  2. 8
  3. 27
  4. 14
  5. 15
  6. 7
  7. 16
  8. 17
  9. 32
  10. 10
  11. 55
  12. 12
  13. 6
  14. 16
  15. 15
  16. 15
  17. 18
  18. 5
  19. 26
  20. 5
  21. 2
  22. 20
  23. 20
  24. 14
  25. 19
  26. 8
  27. 19
  28. 7
  29. 8
  30. 14
  31. 10
  32. 11
  33. 4
  34. 30
  35. 8
  36. 6
  37. 10
  38. 4
  39. 7
  40. 6

Free maths worksheets lessons, practice and worksheets at talentjr.in/maths-worksheets