← Simple equations lesson New set →

Class 7 Maths Worksheet: Simple Equations

Maths worksheets lesson 51: Simple equations · Set 659 · 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.Nisha thinks of a number, multiplies it by 2 and then adds 3. The result is 15. What is the number?
  2. 2.Rohan thinks of a number, multiplies it by 4 and then adds 4. The result is 60. What is the number?
  3. 3.Solve: n/3 + 20 = 34. What is n?
  4. 4.Solve: 8m + 20 = 132. What is m?
  5. 5.Arjun’s mother is three times as old as Arjun. Their ages add up to 36 years. How old is Arjun?
  6. 6.Solve: 4p + 1 = 45. What is p?
  7. 7.Solve: 6n − 18 = 12. What is n?
  8. 8.Solve: 6(x + 7) = 102. What is x?
  9. 9.Karan’s mother is three times as old as Karan. Their ages add up to 24 years. How old is Karan?
  10. 10.Solve: 5x − 23 = 47. What is x?
  11. 11.Pooja thinks of a number, multiplies it by 2 and then adds 30. The result is 34. What is the number?
  12. 12.Kabir’s mother is four times as old as Kabir. Their ages add up to 40 years. How old is Kabir?
  13. 13.Solve: 9(x + 3) = 153. What is x?
  14. 14.Solve: 4p + 11 = 31. What is p?
  15. 15.Solve: 4p − 2 = 6. What is p?
  16. 16.Solve: 8x + 30 = 94. What is x?
  17. 17.Solve: 7p − 11 = 17. What is p?
  18. 18.Solve: 6p + 14 = 26. What is p?
  19. 19.Pooja thinks of a number, multiplies it by 2 and then adds 23. The result is 53. What is the number?
  20. 20.Solve: 3n − 6 = 6. What is n?
  21. 21.Solve: p/3 + 7 = 18. What is p?
  22. 22.Solve: 3m + 27 = 36. What is m?
  23. 23.Solve: y/9 + 17 = 25. What is y?
  24. 24.Solve: 4t − 36 = 20. What is t?
  25. 25.Solve: 8p + 8 = 120. What is p?
  26. 26.Solve: n/6 + 4 = 18. What is n?
  27. 27.Solve: 7m + 21 = 49. What is m?
  28. 28.Solve: 3y − 4 = 2. What is y?
  29. 29.Dev’s mother is three times as old as Dev. Their ages add up to 20 years. How old is Dev?
  30. 30.Solve: 3n + 3 = 6. What is n?
  31. 31.Solve: 2m + 26 = 48. What is m?
  32. 32.Rahul thinks of a number, multiplies it by 4 and then adds 18. The result is 38. What is the number?
  33. 33.Solve: x/4 + 1 = 3. What is x?
  34. 34.Solve: 2p + 16 = 26. What is p?
  35. 35.Kavya thinks of a number, multiplies it by 5 and then adds 10. The result is 35. What is the number?
  36. 36.Joseph’s mother is twice as old as Joseph. Their ages add up to 18 years. How old is Joseph?
  37. 37.Aarav thinks of a number, multiplies it by 7 and then adds 17. The result is 24. What is the number?
  38. 38.Solve: 4m + 17 = 41. What is m?
  39. 39.Solve: 3(y + 7) = 54. What is y?
  40. 40.Solve: 8n + 7 = 111. What is n?

Answer key

  1. 6
  2. 14
  3. 42
  4. 14
  5. 9
  6. 11
  7. 5
  8. 10
  9. 6
  10. 14
  11. 2
  12. 8
  13. 14
  14. 5
  15. 2
  16. 8
  17. 4
  18. 2
  19. 15
  20. 4
  21. 33
  22. 3
  23. 72
  24. 14
  25. 14
  26. 84
  27. 4
  28. 2
  29. 5
  30. 1
  31. 11
  32. 5
  33. 8
  34. 5
  35. 5
  36. 6
  37. 1
  38. 6
  39. 11
  40. 13

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