← Simple equations lesson New set →

Class 7 Maths Worksheet: Simple Equations

Maths worksheets lesson 51: Simple equations · Set 697 · 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: 2p + 9 = 21. What is p?
  2. 2.Solve: 8x − 4 = 4. What is x?
  3. 3.Lakshmi is 3 years older than a cousin. Their ages add up to 31 years. How old is the cousin?
  4. 4.Solve: 2(y + 5) = 32. What is y?
  5. 5.Solve: x/3 + 12 = 13. What is x?
  6. 6.Solve: 6t − 27 = 15. What is t?
  7. 7.Solve: 3(x + 5) = 21. What is x?
  8. 8.Gurpreet thinks of a number, multiplies it by 8 and then adds 3. The result is 51. What is the number?
  9. 9.Solve: 2y + 21 = 47. What is y?
  10. 10.Gurpreet’s mother is twice as old as Gurpreet. Their ages add up to 12 years. How old is Gurpreet?
  11. 11.Pooja thinks of a number, multiplies it by 7 and then adds 6. The result is 48. What is the number?
  12. 12.Solve: 9(y + 7) = 198. What is y?
  13. 13.Dev’s mother is twice as old as Dev. Their ages add up to 21 years. How old is Dev?
  14. 14.Tara thinks of a number, multiplies it by 8 and then adds 5. The result is 85. What is the number?
  15. 15.Isha thinks of a number, multiplies it by 9 and then adds 28. The result is 82. What is the number?
  16. 16.Solve: 9x + 6 = 123. What is x?
  17. 17.Solve: 4(p + 6) = 68. What is p?
  18. 18.Solve: 5m − 4 = 1. What is m?
  19. 19.Solve: 8t + 10 = 98. What is t?
  20. 20.Solve: 4n − 13 = 39. What is n?
  21. 21.Solve: x/9 + 2 = 14. What is x?
  22. 22.Solve: 2y + 12 = 38. What is y?
  23. 23.Solve: x/5 + 17 = 21. What is x?
  24. 24.Solve: m/6 + 15 = 17. What is m?
  25. 25.Solve: x/4 + 7 = 10. What is x?
  26. 26.Solve: m/2 + 2 = 11. What is m?
  27. 27.Solve: 3x − 8 = 4. What is x?
  28. 28.Meera thinks of a number, multiplies it by 7 and then adds 4. The result is 32. What is the number?
  29. 29.Manav’s mother is three times as old as Manav. Their ages add up to 48 years. How old is Manav?
  30. 30.Riya thinks of a number, multiplies it by 7 and then adds 6. The result is 111. What is the number?
  31. 31.Solve: 2x − 1 = 3. What is x?
  32. 32.Solve: 2(y + 8) = 30. What is y?
  33. 33.Solve: 3(p + 3) = 21. What is p?
  34. 34.Solve: 3t + 4 = 49. What is t?
  35. 35.Solve: y/3 + 18 = 31. What is y?
  36. 36.Solve: 9(p + 4) = 135. What is p?
  37. 37.Solve: 5(n + 5) = 30. What is n?
  38. 38.Aarav thinks of a number, multiplies it by 2 and then adds 23. The result is 31. What is the number?
  39. 39.Manav is 1 years older than a cousin. Their ages add up to 15 years. How old is the cousin?
  40. 40.Solve: 3y − 13 = 8. What is y?

Answer key

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

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