← Simple equations lesson New set →

Class 7 Maths Worksheet: Simple Equations

Maths worksheets lesson 51: Simple equations · Set 768 · 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: 3(y + 3) = 39. What is y?
  2. 2.Solve: 3x + 5 = 26. What is x?
  3. 3.Solve: 5p + 16 = 41. What is p?
  4. 4.Priya thinks of a number, multiplies it by 2 and then adds 4. The result is 22. What is the number?
  5. 5.Solve: 5x + 5 = 60. What is x?
  6. 6.Tara thinks of a number, multiplies it by 4 and then adds 19. The result is 59. What is the number?
  7. 7.Solve: 5(m + 1) = 55. What is m?
  8. 8.Karan thinks of a number, multiplies it by 7 and then adds 10. The result is 45. What is the number?
  9. 9.Solve: 9(x + 6) = 144. What is x?
  10. 10.Aarav thinks of a number, multiplies it by 9 and then adds 7. The result is 16. What is the number?
  11. 11.Solve: 2(x + 8) = 34. What is x?
  12. 12.Solve: 3m + 19 = 25. What is m?
  13. 13.Solve: 5p − 2 = 13. What is p?
  14. 14.Solve: 6n − 47 = 31. What is n?
  15. 15.Tara thinks of a number, multiplies it by 3 and then adds 22. The result is 37. What is the number?
  16. 16.Solve: 2n − 6 = 24. What is n?
  17. 17.Solve: 3n + 10 = 31. What is n?
  18. 18.Solve: 8(y + 1) = 32. What is y?
  19. 19.Tara thinks of a number, multiplies it by 9 and then adds 25. The result is 88. What is the number?
  20. 20.Solve: p/5 + 4 = 18. What is p?
  21. 21.Solve: y/4 + 10 = 18. What is y?
  22. 22.Solve: 3m − 1 = 8. What is m?
  23. 23.Solve: 6x − 23 = 1. What is x?
  24. 24.Solve: 3n + 25 = 34. What is n?
  25. 25.Aditya is 7 years older than a cousin. Their ages add up to 27 years. How old is the cousin?
  26. 26.Gurpreet thinks of a number, multiplies it by 7 and then adds 11. The result is 32. What is the number?
  27. 27.Solve: y/8 + 17 = 25. What is y?
  28. 28.Solve: 6(x + 7) = 126. What is x?
  29. 29.Kabir thinks of a number, multiplies it by 2 and then adds 7. The result is 33. What is the number?
  30. 30.Solve: 5(n + 9) = 55. What is n?
  31. 31.Rohan is 3 years older than a cousin. Their ages add up to 25 years. How old is the cousin?
  32. 32.Isha is 5 years older than a cousin. Their ages add up to 13 years. How old is the cousin?
  33. 33.Solve: n/5 + 6 = 11. What is n?
  34. 34.Solve: 4m + 19 = 47. What is m?
  35. 35.Solve: 8p + 26 = 130. What is p?
  36. 36.Tara’s mother is three times as old as Tara. Their ages add up to 36 years. How old is Tara?
  37. 37.Solve: 7(x + 4) = 35. What is x?
  38. 38.Solve: 9p − 2 = 25. What is p?
  39. 39.Solve: 9(m + 4) = 90. What is m?
  40. 40.Solve: 8p − 9 = 47. What is p?

Answer key

  1. 10
  2. 7
  3. 5
  4. 9
  5. 11
  6. 10
  7. 10
  8. 5
  9. 10
  10. 1
  11. 9
  12. 2
  13. 3
  14. 13
  15. 5
  16. 15
  17. 7
  18. 3
  19. 7
  20. 70
  21. 32
  22. 3
  23. 4
  24. 3
  25. 10
  26. 3
  27. 64
  28. 14
  29. 13
  30. 2
  31. 11
  32. 4
  33. 25
  34. 7
  35. 13
  36. 9
  37. 1
  38. 3
  39. 6
  40. 7

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