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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 11 · 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 60. What is the smallest of them?
  2. 2.Solve: 9y + 1 = 3y + 79. What is y?
  3. 3.The length of a rectangle is 6 cm more than its width. Its perimeter is 28 cm. What is its width (in cm)?
  4. 4.The length of a rectangle is 5 cm more than its width. Its perimeter is 30 cm. What is its width (in cm)?
  5. 5.The length of a rectangle is 10 cm more than its width. Its perimeter is 28 cm. What is its width (in cm)?
  6. 6.Solve: 5(y − 4) = y + 40. What is y?
  7. 7.The length of a rectangle is 13 cm more than its width. Its perimeter is 34 cm. What is its width (in cm)?
  8. 8.Solve: 6(p − 1) = 2p + 30. What is p?
  9. 9.Solve: 4(x − 4) = 3x + 10. What is x?
  10. 10.Solve: p/4 + p/5 = 63. What is p?
  11. 11.Solve: 5n + 11 = 3n + 23. What is n?
  12. 12.Solve: y/2 + y/3 = 30. What is y?
  13. 13.The sum of three consecutive whole numbers is 57. What is the smallest of them?
  14. 14.A father is 12 years older than his son. In 1 year, the father will be three times as old as his son. How old is the son now?
  15. 15.Solve: t/3 + t/6 = 21. What is t?
  16. 16.The sum of four consecutive whole numbers is 74. What is the smallest of them?
  17. 17.The length of a rectangle is 13 cm more than its width. Its perimeter is 102 cm. What is its width (in cm)?
  18. 18.The length of a rectangle is 6 cm more than its width. Its perimeter is 76 cm. What is its width (in cm)?
  19. 19.Solve: t/2 + t/5 = 42. What is t?
  20. 20.Solve: 6y + 10 = 3y + 46. What is y?
  21. 21.The length of a rectangle is 6 cm more than its width. Its perimeter is 80 cm. What is its width (in cm)?
  22. 22.Solve: 5x + 3 = 4x + 10. What is x?
  23. 23.Solve: x/4 + x/2 = 15. What is x?
  24. 24.The length of a rectangle is 7 cm more than its width. Its perimeter is 38 cm. What is its width (in cm)?
  25. 25.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?
  26. 26.A father is 48 years older than his son. In 7 years, the father will be four times as old as his son. How old is the son now?
  27. 27.Solve: 4(y − 3) = 2y + 26. What is y?
  28. 28.Solve: x/4 + x/6 = 30. What is x?
  29. 29.The sum of two consecutive whole numbers is 29. What is the largest of them?
  30. 30.Solve: 5t + 8 = 2t + 35. What is t?
  31. 31.The length of a rectangle is 5 cm more than its width. Its perimeter is 26 cm. What is its width (in cm)?
  32. 32.Solve: 4(t − 4) = 3t + 7. What is t?
  33. 33.Solve: 9t + 15 = t + 63. What is t?
  34. 34.Solve: 5(p − 4) = 4p + 4. What is p?
  35. 35.Solve: 4(m − 5) = m + 37. What is m?
  36. 36.Solve: 4(t − 3) = 3t + 3. What is t?
  37. 37.A father is 5 years older than his son. In 2 years, the father will be twice as old as his son. How old is the son now?
  38. 38.The sum of two consecutive whole numbers is 107. What is the smallest of them?
  39. 39.Solve: 6(t − 4) = 2t + 8. What is t?
  40. 40.Solve: m/6 + m/3 = 3. What is m?

Answer key

  1. 19
  2. 13
  3. 4
  4. 5
  5. 2
  6. 15
  7. 2
  8. 9
  9. 26
  10. 140
  11. 6
  12. 36
  13. 18
  14. 5
  15. 42
  16. 17
  17. 19
  18. 16
  19. 60
  20. 12
  21. 17
  22. 7
  23. 20
  24. 6
  25. 4
  26. 9
  27. 19
  28. 72
  29. 15
  30. 9
  31. 4
  32. 23
  33. 6
  34. 24
  35. 19
  36. 15
  37. 3
  38. 53
  39. 8
  40. 6

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