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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 124 · 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/2 + p/6 = 20. What is p?
  2. 2.A father is 10 years older than his son. In 4 years, the father will be twice as old as his son. How old is the son now?
  3. 3.Solve: y/2 + y/5 = 35. What is y?
  4. 4.A father is 18 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?
  5. 5.The length of a rectangle is 6 cm more than its width. Its perimeter is 44 cm. What is its width (in cm)?
  6. 6.Solve: x/6 + x/5 = 88. What is x?
  7. 7.The length of a rectangle is 4 cm more than its width. Its perimeter is 68 cm. What is its width (in cm)?
  8. 8.A father is 7 years older than his son. In 3 years, the father will be twice as old as his son. How old is the son now?
  9. 9.The sum of two consecutive whole numbers is 79. What is the smallest of them?
  10. 10.Solve: 3(p − 1) = 2p + 13. What is p?
  11. 11.The sum of four consecutive whole numbers is 198. What is the largest of them?
  12. 12.Solve: n/2 + n/4 = 6. What is n?
  13. 13.Solve: m/3 + m/5 = 40. What is m?
  14. 14.Solve: m/4 + m/5 = 9. What is m?
  15. 15.Solve: 3(y − 4) = y + 10. What is y?
  16. 16.Solve: 4(p − 2) = 2p + 18. What is p?
  17. 17.The length of a rectangle is 9 cm more than its width. Its perimeter is 98 cm. What is its width (in cm)?
  18. 18.Solve: 4(y − 4) = y + 38. What is y?
  19. 19.A father is 3 years older than his son. In 1 year, the father will be twice as old as his son. How old is the son now?
  20. 20.Solve: m/6 + m/2 = 24. What is m?
  21. 21.Solve: 6p + 17 = 2p + 73. What is p?
  22. 22.Solve: y/3 + y/5 = 24. What is y?
  23. 23.A father is 8 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?
  24. 24.The sum of four consecutive whole numbers is 114. What is the largest of them?
  25. 25.Solve: p/6 + p/2 = 24. What is p?
  26. 26.A father is 48 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?
  27. 27.The sum of four consecutive whole numbers is 158. What is the largest of them?
  28. 28.Solve: 6(t − 5) = 2t + 6. What is t?
  29. 29.The length of a rectangle is 13 cm more than its width. Its perimeter is 62 cm. What is its width (in cm)?
  30. 30.Solve: n/2 + n/5 = 7. What is n?
  31. 31.The sum of two consecutive whole numbers is 121. What is the smallest of them?
  32. 32.Solve: y/4 + y/6 = 5. What is y?
  33. 33.The sum of four consecutive whole numbers is 174. What is the largest of them?
  34. 34.Solve: 8n + 17 = 2n + 35. What is n?
  35. 35.The sum of three consecutive whole numbers is 126. What is the smallest of them?
  36. 36.A father is 36 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?
  37. 37.The sum of three consecutive whole numbers is 30. What is the largest of them?
  38. 38.The length of a rectangle is 4 cm more than its width. Its perimeter is 56 cm. What is its width (in cm)?
  39. 39.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?
  40. 40.Solve: 4(p − 3) = 2p + 6. What is p?

Answer key

  1. 30
  2. 6
  3. 50
  4. 8
  5. 8
  6. 240
  7. 15
  8. 4
  9. 39
  10. 16
  11. 51
  12. 8
  13. 75
  14. 20
  15. 11
  16. 13
  17. 20
  18. 18
  19. 2
  20. 36
  21. 14
  22. 45
  23. 3
  24. 30
  25. 36
  26. 11
  27. 41
  28. 9
  29. 9
  30. 10
  31. 60
  32. 12
  33. 45
  34. 3
  35. 41
  36. 11
  37. 11
  38. 12
  39. 3
  40. 9

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