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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 258 · 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: 4y + 8 = y + 20. What is y?
  2. 2.Solve: 4p + 16 = 3p + 20. What is p?
  3. 3.Solve: 5(t − 2) = t + 30. What is t?
  4. 4.A father is 14 years older than his son. In 5 years, the father will be twice as old as his son. How old is the son now?
  5. 5.The sum of two consecutive whole numbers is 97. What is the largest of them?
  6. 6.The sum of four consecutive whole numbers is 150. What is the smallest of them?
  7. 7.Solve: t/2 + t/5 = 49. What is t?
  8. 8.Solve: 6(y − 4) = 5y + 5. What is y?
  9. 9.Solve: 5(x − 3) = x + 49. What is x?
  10. 10.Solve: 4(t − 5) = t + 28. What is t?
  11. 11.A father is 51 years older than his son. In 8 years, the father will be four times as old as his son. How old is the son now?
  12. 12.The length of a rectangle is 2 cm more than its width. Its perimeter is 60 cm. What is its width (in cm)?
  13. 13.A father is 57 years older than his son. In 8 years, the father will be four times as old as his son. How old is the son now?
  14. 14.Solve: t/2 + t/4 = 12. What is t?
  15. 15.The sum of two consecutive whole numbers is 89. What is the smallest of them?
  16. 16.A father is 20 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?
  17. 17.Solve: 9t + 4 = 6t + 43. What is t?
  18. 18.Solve: 8m + 13 = 3m + 63. What is m?
  19. 19.A father is 14 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?
  20. 20.Solve: 4(n − 5) = 3n + 5. What is n?
  21. 21.Solve: m/4 + m/2 = 15. What is m?
  22. 22.Solve: 6(n − 1) = 2n + 30. What is n?
  23. 23.A father is 22 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?
  24. 24.Solve: x/5 + x/6 = 88. What is x?
  25. 25.Solve: t/6 + t/2 = 20. What is t?
  26. 26.Solve: 7p + 10 = 4p + 40. What is p?
  27. 27.The sum of two consecutive whole numbers is 19. What is the largest of them?
  28. 28.Solve: 3m + 15 = 2m + 17. What is m?
  29. 29.Solve: 5p + 15 = 4p + 23. What is p?
  30. 30.The sum of three consecutive whole numbers is 177. What is the largest of them?
  31. 31.Solve: 9t + 1 = 3t + 91. What is t?
  32. 32.The sum of two consecutive whole numbers is 109. What is the smallest of them?
  33. 33.The length of a rectangle is 12 cm more than its width. Its perimeter is 32 cm. What is its width (in cm)?
  34. 34.Solve: 9m + 17 = m + 113. What is m?
  35. 35.Solve: 7x + 2 = 6x + 4. What is x?
  36. 36.A father is 20 years older than his son. In 3 years, the father will be three times as old as his son. How old is the son now?
  37. 37.Solve: p/5 + p/3 = 40. What is p?
  38. 38.Solve: 3p + 1 = 2p + 8. What is p?
  39. 39.Solve: 3(x − 2) = x + 4. What is x?
  40. 40.A father is 11 years older than his son. In 4 years, the father will be twice as old as his son. How old is the son now?

Answer key

  1. 4
  2. 4
  3. 10
  4. 9
  5. 49
  6. 36
  7. 70
  8. 29
  9. 16
  10. 16
  11. 9
  12. 14
  13. 11
  14. 16
  15. 44
  16. 3
  17. 13
  18. 10
  19. 5
  20. 25
  21. 20
  22. 9
  23. 4
  24. 240
  25. 30
  26. 10
  27. 10
  28. 2
  29. 8
  30. 60
  31. 15
  32. 54
  33. 2
  34. 12
  35. 2
  36. 7
  37. 75
  38. 7
  39. 5
  40. 7

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