Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 670 · 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 three consecutive whole numbers is 93. What is the smallest of them?
2. 2.Solve: 4m + 13 = 2m + 21. What is m?
3. 3.Solve: 4(n − 4) = 3n + 1. What is n?
4. 4.The sum of two consecutive whole numbers is 29. What is the smallest of them?
5. 5.A father is 28 years older than his son. In 6 years, the father will be three times as old as his son. How old is the son now?
6. 6.Solve: 4(t − 2) = 3t + 9. What is t?
7. 7.A father is 36 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?
8. 8.Solve: 6x + 5 = 5x + 6. What is x?
9. 9.Solve: 6(p − 2) = p + 53. What is p?
10. 10.A father is 11 years older than his son. In 4 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 50 cm. What is its width (in cm)?
12. 12.A father is 14 years older than his son. In 3 years, the father will be twice as old as his son. How old is the son now?
13. 13.Solve: 6(x − 4) = 5x + 2. What is x?
14. 14.The sum of three consecutive whole numbers is 141. What is the largest of them?
15. 15.Solve: m/6 + m/3 = 9. What is m?
16. 16.Solve: 9n + 6 = 3n + 90. What is n?
17. 17.Solve: m/4 + m/6 = 40. What is m?
18. 18.Solve: 6x + 19 = 4x + 21. What is x?
19. 19.Solve: x/3 + x/5 = 56. What is x?
20. 20.The length of a rectangle is 7 cm more than its width. Its perimeter is 54 cm. What is its width (in cm)?
21. 21.Solve: 4x + 10 = 3x + 21. What is x?
22. 22.A father is 22 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?
23. 23.The length of a rectangle is 4 cm more than its width. Its perimeter is 68 cm. What is its width (in cm)?
24. 24.The sum of three consecutive whole numbers is 63. What is the largest of them?
25. 25.A father is 9 years older than his son. In 4 years, the father will be twice as old as his son. How old is the son now?
26. 26.Solve: n/2 + n/5 = 56. What is n?
27. 27.The length of a rectangle is 1 cm more than its width. Its perimeter is 94 cm. What is its width (in cm)?
28. 28.The sum of four consecutive whole numbers is 30. What is the smallest of them?
29. 29.The sum of three consecutive whole numbers is 27. What is the smallest of them?
30. 30.Solve: 5(m − 3) = 3m + 23. What is m?
31. 31.A father is 16 years older than his son. In 6 years, the father will be twice as old as his son. How old is the son now?
32. 32.Solve: 7x + 1 = x + 73. What is x?
33. 33.Solve: t/5 + t/4 = 27. What is t?
34. 34.The length of a rectangle is 13 cm more than its width. Its perimeter is 42 cm. What is its width (in cm)?
35. 35.The length of a rectangle is 2 cm more than its width. Its perimeter is 116 cm. What is its width (in cm)?
36. 36.Solve: 6(t − 2) = 3t + 18. What is t?
37. 37.Solve: n/5 + n/4 = 9. What is n?
38. 38.A father is 9 years older than his son. In 1 year, the father will be twice as old as his son. How old is the son now?
39. 39.Solve: 5x + 11 = 3x + 17. What is x?
40. 40.The sum of two consecutive whole numbers is 107. What is the largest of them?

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