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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 150 · 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: p/4 + p/6 = 20. What is p?
  2. 2.Solve: 3n + 19 = 2n + 23. What is n?
  3. 3.Solve: 3(p − 1) = p + 3. What is p?
  4. 4.The sum of two consecutive whole numbers is 37. What is the smallest of them?
  5. 5.Solve: 3(p − 1) = p + 23. What is p?
  6. 6.Solve: t/3 + t/6 = 24. What is t?
  7. 7.The sum of three consecutive whole numbers is 24. What is the largest of them?
  8. 8.The sum of two consecutive whole numbers is 63. What is the largest of them?
  9. 9.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?
  10. 10.The sum of four consecutive whole numbers is 178. What is the smallest of them?
  11. 11.Solve: p/2 + p/3 = 40. What is p?
  12. 12.The sum of four consecutive whole numbers is 126. What is the smallest of them?
  13. 13.The sum of two consecutive whole numbers is 41. What is the largest of them?
  14. 14.Solve: 8m + 5 = m + 103. What is m?
  15. 15.Solve: 4n + 9 = n + 51. What is n?
  16. 16.The length of a rectangle is 10 cm more than its width. Its perimeter is 104 cm. What is its width (in cm)?
  17. 17.The sum of three consecutive whole numbers is 51. What is the largest of them?
  18. 18.Solve: 9m + 1 = 6m + 16. What is m?
  19. 19.Solve: 6x + 15 = 4x + 39. What is x?
  20. 20.Solve: m/5 + m/3 = 32. What is m?
  21. 21.The length of a rectangle is 7 cm more than its width. Its perimeter is 42 cm. What is its width (in cm)?
  22. 22.The sum of three consecutive whole numbers is 180. What is the smallest of them?
  23. 23.The sum of two consecutive whole numbers is 55. What is the largest of them?
  24. 24.Solve: 4(p − 1) = 2p + 22. What is p?
  25. 25.Solve: t/5 + t/6 = 11. What is t?
  26. 26.Solve: 3(n − 4) = 2n + 7. What is n?
  27. 27.Solve: 4(x − 1) = 3x + 7. What is x?
  28. 28.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?
  29. 29.The length of a rectangle is 3 cm more than its width. Its perimeter is 58 cm. What is its width (in cm)?
  30. 30.Solve: 4(y − 5) = y + 13. What is y?
  31. 31.Solve: 6(m − 1) = m + 19. What is m?
  32. 32.The length of a rectangle is 15 cm more than its width. Its perimeter is 42 cm. What is its width (in cm)?
  33. 33.Solve: 4x + 1 = 3x + 2. What is x?
  34. 34.Solve: 4m + 1 = 2m + 25. What is m?
  35. 35.A father is 21 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?
  36. 36.The sum of four consecutive whole numbers is 98. What is the smallest of them?
  37. 37.Solve: t/3 + t/2 = 40. What is t?
  38. 38.A father is 27 years older than his son. In 3 years, the father will be four times as old as his son. How old is the son now?
  39. 39.Solve: p/2 + p/6 = 8. What is p?
  40. 40.Solve: 3(x − 2) = x + 26. What is x?

Answer key

  1. 48
  2. 4
  3. 3
  4. 18
  5. 13
  6. 48
  7. 9
  8. 32
  9. 4
  10. 43
  11. 48
  12. 30
  13. 21
  14. 14
  15. 14
  16. 21
  17. 18
  18. 5
  19. 12
  20. 60
  21. 7
  22. 59
  23. 28
  24. 13
  25. 30
  26. 19
  27. 11
  28. 7
  29. 13
  30. 11
  31. 5
  32. 3
  33. 1
  34. 12
  35. 5
  36. 23
  37. 48
  38. 6
  39. 12
  40. 16

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