Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 105 · 40 sums

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.

1. 1.The sum of four consecutive whole numbers is 34. What is the smallest of them?
2. 2.A father is 16 years older than his son. In 5 years, the father will be three times as old as his son. How old is the son now?
3. 3.The sum of three consecutive whole numbers is 111. What is the smallest of them?
4. 4.A father is 5 years older than his son. In 1 year, the father will be twice as old as his son. How old is the son now?
5. 5.Solve: n/6 + n/2 = 28. What is n?
6. 6.Solve: 3(y − 5) = 2y + 3. What is y?
7. 7.The length of a rectangle is 3 cm more than its width. Its perimeter is 110 cm. What is its width (in cm)?
8. 8.Solve: 8y + 11 = 6y + 29. What is y?
9. 9.Solve: 4x + 17 = x + 53. What is x?
10. 10.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?
11. 11.The length of a rectangle is 5 cm more than its width. Its perimeter is 94 cm. What is its width (in cm)?
12. 12.The sum of four consecutive whole numbers is 30. What is the largest of them?
13. 13.Solve: 3t + 4 = t + 18. What is t?
14. 14.Solve: y/3 + y/4 = 42. What is y?
15. 15.The sum of two consecutive whole numbers is 55. What is the largest of them?
16. 16.A father is 24 years older than his son. In 6 years, the father will be four times as old as his son. How old is the son now?
17. 17.Solve: 8p + 4 = 7p + 12. What is p?
18. 18.Solve: m/5 + m/3 = 24. What is m?
19. 19.The length of a rectangle is 1 cm more than its width. Its perimeter is 58 cm. What is its width (in cm)?
20. 20.The length of a rectangle is 1 cm more than its width. Its perimeter is 82 cm. What is its width (in cm)?
21. 21.Solve: 5(t − 4) = 4t + 1. What is t?
22. 22.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?
23. 23.A father is 9 years older than his son. In 5 years, the father will be twice as old as his son. How old is the son now?
24. 24.Solve: 4(n − 3) = 2n + 8. What is n?
25. 25.Solve: 3(n − 3) = 2n + 5. What is n?
26. 26.Solve: 5(x − 3) = 4x + 5. What is x?
27. 27.The length of a rectangle is 8 cm more than its width. Its perimeter is 48 cm. What is its width (in cm)?
28. 28.Solve: 5(t − 2) = 2t + 23. What is t?
29. 29.Solve: 5m + 17 = m + 29. What is m?
30. 30.The sum of two consecutive whole numbers is 79. What is the largest of them?
31. 31.Solve: 3(p − 2) = 2p + 2. What is p?
32. 32.The length of a rectangle is 15 cm more than its width. Its perimeter is 102 cm. What is its width (in cm)?
33. 33.A father is 10 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?
34. 34.Solve: 3p + 12 = 2p + 14. What is p?
35. 35.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?
36. 36.The length of a rectangle is 5 cm more than its width. Its perimeter is 102 cm. What is its width (in cm)?
37. 37.Solve: 5(m − 2) = 2m + 35. What is m?
38. 38.The length of a rectangle is 11 cm more than its width. Its perimeter is 78 cm. What is its width (in cm)?
39. 39.The length of a rectangle is 8 cm more than its width. Its perimeter is 36 cm. What is its width (in cm)?
40. 40.Solve: 4(n − 4) = 2n + 22. What is n?

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