Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 471 · 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.Solve: t/3 + t/2 = 20. What is t?
2. 2.Solve: m/5 + m/2 = 49. What is m?
3. 3.Solve: 4(m − 1) = 2m + 4. What is m?
4. 4.Solve: 3(p − 1) = 2p + 11. What is p?
5. 5.The length of a rectangle is 3 cm more than its width. Its perimeter is 114 cm. What is its width (in cm)?
6. 6.Solve: 5p + 15 = p + 55. What is p?
7. 7.Solve: 3(p − 1) = 2p + 1. What is p?
8. 8.Solve: 5m + 17 = 4m + 25. What is m?
9. 9.The length of a rectangle is 11 cm more than its width. Its perimeter is 46 cm. What is its width (in cm)?
10. 10.A father is 26 years older than his son. In 4 years, the father will be three times as old as his son. How old is the son now?
11. 11.The sum of two consecutive whole numbers is 13. What is the smallest of them?
12. 12.Solve: 6(x − 3) = 4x + 8. What is x?
13. 13.The sum of three consecutive whole numbers is 78. What is the largest of them?
14. 14.The length of a rectangle is 6 cm more than its width. Its perimeter is 100 cm. What is its width (in cm)?
15. 15.The sum of two consecutive whole numbers is 59. What is the smallest of them?
16. 16.The sum of two consecutive whole numbers is 43. What is the largest of them?
17. 17.Solve: t/5 + t/3 = 16. What is t?
18. 18.Solve: 6(n − 3) = 3n + 6. What is n?
19. 19.Solve: 5(n − 2) = 2n + 23. What is n?
20. 20.The length of a rectangle is 2 cm more than its width. Its perimeter is 12 cm. What is its width (in cm)?
21. 21.The length of a rectangle is 7 cm more than its width. Its perimeter is 54 cm. What is its width (in cm)?
22. 22.Solve: 3(t − 4) = 2t + 9. What is t?
23. 23.A father is 12 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.The sum of four consecutive whole numbers is 210. What is the largest of them?
25. 25.A father is 15 years older than his son. In 3 years, the father will be twice as old as his son. How old is the son now?
26. 26.Solve: m/3 + m/4 = 7. What is m?
27. 27.Solve: 3(y − 5) = 2y + 4. What is y?
28. 28.The sum of two consecutive whole numbers is 49. What is the largest of them?
29. 29.The length of a rectangle is 5 cm more than its width. Its perimeter is 30 cm. What is its width (in cm)?
30. 30.The length of a rectangle is 8 cm more than its width. Its perimeter is 124 cm. What is its width (in cm)?
31. 31.The sum of two consecutive whole numbers is 55. What is the largest of them?
32. 32.Solve: 5(x − 1) = 2x + 19. What is x?
33. 33.The length of a rectangle is 1 cm more than its width. Its perimeter is 46 cm. What is its width (in cm)?
34. 34.Solve: m/4 + m/3 = 49. What is m?
35. 35.The sum of four consecutive whole numbers is 74. What is the smallest of them?
36. 36.A father is 18 years older than his son. In 2 years, the father will be three times as old as his son. How old is the son now?
37. 37.Solve: 4(n − 4) = n + 2. What is n?
38. 38.A father is 18 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?
39. 39.The sum of three consecutive whole numbers is 120. What is the largest of them?
40. 40.The length of a rectangle is 4 cm more than its width. Its perimeter is 40 cm. What is its width (in cm)?

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