← Simple equations lesson New set →

Class 7 Maths Worksheet: Simple Equations

Maths worksheets lesson 51: Simple equations · Set 583 · 40 sums
TalentJR

The method (Undo in reverse): ax + b = c → ax = c − b → x = (c − b) ÷ a. ax − b = c → ax = c + b. x/a + b = c → x/a = c − b → x = a × (c − b). a(x + b) = c → divide by a first: x + b = c ÷ a. Word problems: call the unknown x, write the equation, solve it, then check with the story.

NameDateTime takenScore ___ / 40
  1. 1.Solve: 9n + 27 = 72. What is n?
  2. 2.Solve: 8m − 7 = 73. What is m?
  3. 3.Solve: x/6 + 1 = 7. What is x?
  4. 4.Solve: m/2 + 6 = 13. What is m?
  5. 5.Solve: m/6 + 11 = 21. What is m?
  6. 6.Solve: 3(y + 8) = 36. What is y?
  7. 7.Zoya thinks of a number, multiplies it by 7 and then adds 20. The result is 41. What is the number?
  8. 8.Solve: 9x + 11 = 110. What is x?
  9. 9.Rahul is 1 years older than a cousin. Their ages add up to 25 years. How old is the cousin?
  10. 10.Ishaan thinks of a number, multiplies it by 3 and then adds 9. The result is 42. What is the number?
  11. 11.Solve: 5p − 14 = 41. What is p?
  12. 12.Solve: 7m − 9 = 5. What is m?
  13. 13.Kavya is 4 years older than a cousin. Their ages add up to 20 years. How old is the cousin?
  14. 14.Solve: 6p + 5 = 89. What is p?
  15. 15.Solve: 3p − 1 = 2. What is p?
  16. 16.Solve: y/5 + 15 = 26. What is y?
  17. 17.Solve: p/2 + 4 = 8. What is p?
  18. 18.Solve: 9y − 48 = 6. What is y?
  19. 19.Solve: 9n + 10 = 109. What is n?
  20. 20.Solve: m/6 + 4 = 5. What is m?
  21. 21.Solve: 7n + 18 = 25. What is n?
  22. 22.Solve: t/4 + 5 = 16. What is t?
  23. 23.Solve: 6(y + 6) = 108. What is y?
  24. 24.Solve: p/7 + 1 = 9. What is p?
  25. 25.Solve: 4y + 16 = 52. What is y?
  26. 26.Solve: p/6 + 2 = 14. What is p?
  27. 27.Solve: 9(t + 6) = 108. What is t?
  28. 28.Meera thinks of a number, multiplies it by 2 and then adds 28. The result is 42. What is the number?
  29. 29.Solve: 4p − 8 = 4. What is p?
  30. 30.Solve: x/6 + 19 = 23. What is x?
  31. 31.Aarav’s mother is three times as old as Aarav. Their ages add up to 28 years. How old is Aarav?
  32. 32.Solve: 3x + 3 = 21. What is x?
  33. 33.Solve: 6p − 2 = 64. What is p?
  34. 34.Lakshmi is 7 years older than a cousin. Their ages add up to 21 years. How old is the cousin?
  35. 35.Solve: 4x + 20 = 48. What is x?
  36. 36.Solve: 9y − 87 = 30. What is y?
  37. 37.Solve: t/2 + 5 = 8. What is t?
  38. 38.Solve: 3n − 11 = 19. What is n?
  39. 39.Saanvi thinks of a number, multiplies it by 5 and then adds 8. The result is 48. What is the number?
  40. 40.Solve: 3x + 17 = 20. What is x?

Answer key

  1. 5
  2. 10
  3. 36
  4. 14
  5. 60
  6. 4
  7. 3
  8. 11
  9. 12
  10. 11
  11. 11
  12. 2
  13. 8
  14. 14
  15. 1
  16. 55
  17. 8
  18. 6
  19. 11
  20. 6
  21. 1
  22. 44
  23. 12
  24. 56
  25. 9
  26. 72
  27. 6
  28. 7
  29. 3
  30. 24
  31. 7
  32. 6
  33. 11
  34. 7
  35. 7
  36. 13
  37. 6
  38. 10
  39. 8
  40. 1

Free maths worksheets lessons, practice and worksheets at talentjr.in/maths-worksheets