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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 586 · 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 length of a rectangle is 8 cm more than its width. Its perimeter is 36 cm. What is its width (in cm)?
  2. 2.Solve: 3(x − 3) = 2x + 12. What is x?
  3. 3.The sum of three consecutive whole numbers is 126. What is the smallest of them?
  4. 4.Solve: 3m + 20 = 2m + 24. What is m?
  5. 5.Solve: 3m + 12 = m + 16. What is m?
  6. 6.Solve: 3m + 8 = 2m + 16. What is m?
  7. 7.A father is 15 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?
  8. 8.The length of a rectangle is 5 cm more than its width. Its perimeter is 98 cm. What is its width (in cm)?
  9. 9.Solve: 3(p − 3) = p + 11. What is p?
  10. 10.Solve: 6(p − 2) = 5p + 10. What is p?
  11. 11.Solve: 4(t − 1) = 3t + 5. What is t?
  12. 12.Solve: 4(t − 3) = 3t + 10. What is t?
  13. 13.Solve: 5(p − 5) = 3p + 21. What is p?
  14. 14.Solve: 4(m − 4) = 3m + 13. What is m?
  15. 15.Solve: m/3 + m/2 = 30. What is m?
  16. 16.The length of a rectangle is 10 cm more than its width. Its perimeter is 68 cm. What is its width (in cm)?
  17. 17.The sum of two consecutive whole numbers is 101. What is the largest of them?
  18. 18.Solve: 3(n − 4) = 2n + 10. What is n?
  19. 19.Solve: 9m + 2 = 2m + 86. What is m?
  20. 20.The sum of two consecutive whole numbers is 77. What is the largest of them?
  21. 21.Solve: 9m + 17 = 4m + 87. What is m?
  22. 22.Solve: m/3 + m/2 = 35. What is m?
  23. 23.Solve: 5(x − 1) = x + 15. What is x?
  24. 24.The sum of two consecutive whole numbers is 71. What is the smallest of them?
  25. 25.Solve: 4(t − 2) = t + 25. What is t?
  26. 26.The sum of three consecutive whole numbers is 93. What is the smallest of them?
  27. 27.The sum of two consecutive whole numbers is 21. What is the smallest of them?
  28. 28.Solve: 4m + 7 = m + 25. What is m?
  29. 29.The sum of four consecutive whole numbers is 198. What is the largest of them?
  30. 30.Solve: 3(p − 3) = p + 9. What is p?
  31. 31.Solve: 3(y − 3) = y + 17. What is y?
  32. 32.A father is 20 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?
  33. 33.Solve: 6(t − 1) = 5t + 11. What is t?
  34. 34.Solve: m/2 + m/4 = 21. What is m?
  35. 35.Solve: 6(n − 5) = 3n + 36. What is n?
  36. 36.A father is 18 years older than his son. In 4 years, the father will be three times as old as his son. How old is the son now?
  37. 37.Solve: 5(p − 3) = p + 17. What is p?
  38. 38.Solve: n/6 + n/2 = 8. What is n?
  39. 39.A father is 13 years older than his son. In 2 years, the father will be twice as old as his son. How old is the son now?
  40. 40.Solve: y/2 + y/5 = 28. What is y?

Answer key

  1. 5
  2. 21
  3. 41
  4. 4
  5. 2
  6. 8
  7. 3
  8. 22
  9. 10
  10. 22
  11. 9
  12. 22
  13. 23
  14. 29
  15. 36
  16. 12
  17. 51
  18. 22
  19. 12
  20. 39
  21. 14
  22. 42
  23. 5
  24. 35
  25. 11
  26. 30
  27. 10
  28. 6
  29. 51
  30. 9
  31. 13
  32. 8
  33. 17
  34. 28
  35. 22
  36. 5
  37. 8
  38. 12
  39. 11
  40. 40

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