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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 833 · 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: 5(m − 4) = 3m + 18. What is m?
  2. 2.The sum of four consecutive whole numbers is 206. What is the smallest of them?
  3. 3.Solve: 8y + 16 = y + 65. What is y?
  4. 4.Solve: 3m + 19 = 2m + 24. What is m?
  5. 5.Solve: 5p + 5 = p + 41. What is p?
  6. 6.The sum of two consecutive whole numbers is 83. What is the smallest of them?
  7. 7.The sum of four consecutive whole numbers is 106. What is the smallest of them?
  8. 8.The sum of two consecutive whole numbers is 99. What is the largest of them?
  9. 9.Solve: p/5 + p/3 = 32. What is p?
  10. 10.Solve: n/6 + n/3 = 3. What is n?
  11. 11.The length of a rectangle is 14 cm more than its width. Its perimeter is 48 cm. What is its width (in cm)?
  12. 12.The length of a rectangle is 13 cm more than its width. Its perimeter is 78 cm. What is its width (in cm)?
  13. 13.The length of a rectangle is 5 cm more than its width. Its perimeter is 22 cm. What is its width (in cm)?
  14. 14.A father is 16 years older than his son. In 4 years, the father will be twice as old as his son. How old is the son now?
  15. 15.The length of a rectangle is 7 cm more than its width. Its perimeter is 110 cm. What is its width (in cm)?
  16. 16.Solve: 3y + 15 = y + 41. What is y?
  17. 17.The length of a rectangle is 1 cm more than its width. Its perimeter is 86 cm. What is its width (in cm)?
  18. 18.The length of a rectangle is 12 cm more than its width. Its perimeter is 140 cm. What is its width (in cm)?
  19. 19.Solve: m/4 + m/3 = 28. What is m?
  20. 20.The sum of four consecutive whole numbers is 182. What is the largest of them?
  21. 21.Solve: 5(n − 2) = 2n + 11. What is n?
  22. 22.A father is 12 years older than his son. In 1 year, the father will be four times as old as his son. How old is the son now?
  23. 23.A father is 26 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?
  24. 24.The sum of three consecutive whole numbers is 162. What is the smallest of them?
  25. 25.Solve: t/5 + t/3 = 64. What is t?
  26. 26.Solve: 5x + 12 = 2x + 27. What is x?
  27. 27.Solve: 4(t − 1) = t + 35. What is t?
  28. 28.Solve: 9p + 15 = p + 39. What is p?
  29. 29.Solve: 9p + 11 = 2p + 109. What is p?
  30. 30.The sum of three consecutive whole numbers is 45. What is the largest of them?
  31. 31.Solve: m/3 + m/2 = 10. What is m?
  32. 32.Solve: x/4 + x/3 = 42. What is x?
  33. 33.The length of a rectangle is 6 cm more than its width. Its perimeter is 36 cm. What is its width (in cm)?
  34. 34.Solve: 5(m − 1) = 3m + 9. What is m?
  35. 35.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?
  36. 36.Solve: 5(t − 5) = 4t + 10. What is t?
  37. 37.The length of a rectangle is 12 cm more than its width. Its perimeter is 132 cm. What is its width (in cm)?
  38. 38.The sum of three consecutive whole numbers is 114. What is the largest of them?
  39. 39.A father is 30 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?
  40. 40.A father is 19 years older than his son. In 8 years, the father will be twice as old as his son. How old is the son now?

Answer key

  1. 19
  2. 50
  3. 7
  4. 5
  5. 9
  6. 41
  7. 25
  8. 50
  9. 60
  10. 6
  11. 5
  12. 13
  13. 3
  14. 12
  15. 24
  16. 13
  17. 21
  18. 29
  19. 48
  20. 47
  21. 7
  22. 3
  23. 5
  24. 53
  25. 120
  26. 5
  27. 13
  28. 3
  29. 14
  30. 16
  31. 12
  32. 72
  33. 6
  34. 7
  35. 5
  36. 35
  37. 27
  38. 39
  39. 12
  40. 11

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