← Simple equations lesson New set →

Class 7 Maths Worksheet: Simple Equations

Maths worksheets lesson 51: Simple equations · Set 787 · 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: m/9 + 9 = 21. What is m?
  2. 2.Zoya thinks of a number, multiplies it by 3 and then adds 21. The result is 51. What is the number?
  3. 3.Meera thinks of a number, multiplies it by 5 and then adds 11. The result is 26. What is the number?
  4. 4.Solve: 5t − 4 = 46. What is t?
  5. 5.Solve: 3(y + 4) = 24. What is y?
  6. 6.Solve: 5t + 4 = 79. What is t?
  7. 7.Solve: 3(x + 1) = 45. What is x?
  8. 8.Solve: 3(t + 6) = 24. What is t?
  9. 9.Kabir is 7 years older than a cousin. Their ages add up to 25 years. How old is the cousin?
  10. 10.Solve: 2p + 29 = 35. What is p?
  11. 11.Isha thinks of a number, multiplies it by 3 and then adds 15. The result is 45. What is the number?
  12. 12.Vivaan thinks of a number, multiplies it by 6 and then adds 5. The result is 41. What is the number?
  13. 13.Solve: 7p − 3 = 11. What is p?
  14. 14.Solve: 7t − 36 = 13. What is t?
  15. 15.Solve: 4n + 29 = 45. What is n?
  16. 16.Solve: 7n − 3 = 18. What is n?
  17. 17.Solve: 4(t + 8) = 40. What is t?
  18. 18.Solve: 8y − 26 = 6. What is y?
  19. 19.Solve: 4n − 7 = 33. What is n?
  20. 20.Solve: 8m + 22 = 54. What is m?
  21. 21.Solve: x/8 + 12 = 17. What is x?
  22. 22.Solve: n/3 + 13 = 24. What is n?
  23. 23.Solve: 6n + 16 = 58. What is n?
  24. 24.Zoya thinks of a number, multiplies it by 2 and then adds 16. The result is 32. What is the number?
  25. 25.Solve: y/8 + 7 = 22. What is y?
  26. 26.Solve: 3t + 9 = 54. What is t?
  27. 27.Solve: x/3 + 2 = 10. What is x?
  28. 28.Kabir’s mother is three times as old as Kabir. Their ages add up to 16 years. How old is Kabir?
  29. 29.Solve: 3n + 30 = 39. What is n?
  30. 30.Tara thinks of a number, multiplies it by 4 and then adds 17. The result is 21. What is the number?
  31. 31.Solve: 9p + 8 = 80. What is p?
  32. 32.Dev’s mother is three times as old as Dev. Their ages add up to 28 years. How old is Dev?
  33. 33.Solve: 8(y + 1) = 104. What is y?
  34. 34.Solve: 4(x + 3) = 40. What is x?
  35. 35.Solve: 8(m + 2) = 112. What is m?
  36. 36.Solve: p/8 + 4 = 12. What is p?
  37. 37.Solve: m/8 + 2 = 15. What is m?
  38. 38.Solve: 8t + 20 = 44. What is t?
  39. 39.Gurpreet thinks of a number, multiplies it by 4 and then adds 1. The result is 57. What is the number?
  40. 40.Solve: 6(n + 4) = 84. What is n?

Answer key

  1. 108
  2. 10
  3. 3
  4. 10
  5. 4
  6. 15
  7. 14
  8. 2
  9. 9
  10. 3
  11. 10
  12. 6
  13. 2
  14. 7
  15. 4
  16. 3
  17. 2
  18. 4
  19. 10
  20. 4
  21. 40
  22. 33
  23. 7
  24. 8
  25. 120
  26. 15
  27. 24
  28. 4
  29. 3
  30. 1
  31. 8
  32. 7
  33. 12
  34. 7
  35. 12
  36. 64
  37. 104
  38. 3
  39. 14
  40. 10

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