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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 139 · 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: y/5 + y/3 = 8. What is y?
  2. 2.The sum of two consecutive whole numbers is 95. What is the largest of them?
  3. 3.Solve: 3(y − 1) = 2y + 1. What is y?
  4. 4.The length of a rectangle is 8 cm more than its width. Its perimeter is 44 cm. What is its width (in cm)?
  5. 5.The sum of three consecutive whole numbers is 81. What is the smallest of them?
  6. 6.The length of a rectangle is 9 cm more than its width. Its perimeter is 94 cm. What is its width (in cm)?
  7. 7.A father is 21 years older than his son. In 5 years, the father will be four times as old as his son. How old is the son now?
  8. 8.Solve: p/5 + p/6 = 77. What is p?
  9. 9.Solve: 3(x − 1) = 2x + 6. What is x?
  10. 10.Solve: p/6 + p/2 = 12. What is p?
  11. 11.Solve: n/5 + n/2 = 28. What is n?
  12. 12.Solve: 4(t − 5) = t + 37. What is t?
  13. 13.Solve: 6(y − 2) = 5y + 7. What is y?
  14. 14.Solve: y/3 + y/4 = 35. What is y?
  15. 15.Solve: 8n + 7 = 3n + 32. What is n?
  16. 16.The length of a rectangle is 2 cm more than its width. Its perimeter is 116 cm. What is its width (in cm)?
  17. 17.The length of a rectangle is 3 cm more than its width. Its perimeter is 98 cm. What is its width (in cm)?
  18. 18.Solve: 7n + 17 = n + 59. What is n?
  19. 19.Solve: t/5 + t/3 = 8. What is t?
  20. 20.The sum of four consecutive whole numbers is 218. What is the smallest of them?
  21. 21.Solve: 6n + 9 = 5n + 21. What is n?
  22. 22.Solve: y/5 + y/4 = 36. What is y?
  23. 23.The sum of two consecutive whole numbers is 67. What is the largest of them?
  24. 24.The length of a rectangle is 14 cm more than its width. Its perimeter is 100 cm. What is its width (in cm)?
  25. 25.Solve: 3(n − 2) = n + 12. What is n?
  26. 26.Solve: 6(m − 1) = 2m + 22. What is m?
  27. 27.Solve: t/2 + t/4 = 21. What is t?
  28. 28.Solve: 7y + 5 = 4y + 35. What is y?
  29. 29.Solve: 5(m − 5) = 4m + 1. What is m?
  30. 30.Solve: 4(y − 2) = 2y + 26. What is y?
  31. 31.The length of a rectangle is 3 cm more than its width. Its perimeter is 106 cm. What is its width (in cm)?
  32. 32.The length of a rectangle is 13 cm more than its width. Its perimeter is 82 cm. What is its width (in cm)?
  33. 33.Solve: 3(m − 5) = m + 19. What is m?
  34. 34.The sum of two consecutive whole numbers is 33. What is the smallest of them?
  35. 35.Solve: 3(x − 3) = x + 7. What is x?
  36. 36.The length of a rectangle is 15 cm more than its width. Its perimeter is 62 cm. What is its width (in cm)?
  37. 37.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?
  38. 38.A father is 38 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?
  39. 39.Solve: 3(t − 1) = t + 13. What is t?
  40. 40.The sum of three consecutive whole numbers is 162. What is the smallest of them?

Answer key

  1. 15
  2. 48
  3. 4
  4. 7
  5. 26
  6. 19
  7. 2
  8. 210
  9. 9
  10. 18
  11. 40
  12. 19
  13. 19
  14. 60
  15. 5
  16. 28
  17. 23
  18. 7
  19. 15
  20. 53
  21. 12
  22. 80
  23. 34
  24. 18
  25. 9
  26. 7
  27. 28
  28. 10
  29. 26
  30. 17
  31. 25
  32. 14
  33. 17
  34. 16
  35. 8
  36. 8
  37. 7
  38. 12
  39. 8
  40. 53

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