← Simple equations lesson New set →

Class 7 Maths Worksheet: Simple Equations

Maths worksheets lesson 51: Simple equations · Set 485 · 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/7 + 18 = 19. What is m?
  2. 2.Ananya thinks of a number, multiplies it by 2 and then adds 7. The result is 15. What is the number?
  3. 3.Solve: 3y − 2 = 4. What is y?
  4. 4.Solve: m/8 + 11 = 21. What is m?
  5. 5.Isha thinks of a number, multiplies it by 3 and then adds 3. The result is 12. What is the number?
  6. 6.Priya’s mother is three times as old as Priya. Their ages add up to 32 years. How old is Priya?
  7. 7.Aarav thinks of a number, multiplies it by 7 and then adds 19. The result is 82. What is the number?
  8. 8.Solve: x/3 + 13 = 15. What is x?
  9. 9.Zoya is 1 years older than a cousin. Their ages add up to 13 years. How old is the cousin?
  10. 10.Solve: t/5 + 16 = 28. What is t?
  11. 11.Solve: 8p − 15 = 89. What is p?
  12. 12.Solve: 6x + 30 = 48. What is x?
  13. 13.Solve: 4t + 10 = 46. What is t?
  14. 14.Aarav thinks of a number, multiplies it by 3 and then adds 19. The result is 46. What is the number?
  15. 15.Solve: 9(x + 9) = 153. What is x?
  16. 16.Solve: y/6 + 19 = 30. What is y?
  17. 17.Solve: 9p − 2 = 7. What is p?
  18. 18.Solve: 9(m + 1) = 126. What is m?
  19. 19.Solve: 9p + 6 = 15. What is p?
  20. 20.Solve: 8n − 9 = 111. What is n?
  21. 21.Solve: t/8 + 2 = 14. What is t?
  22. 22.Solve: 6y + 29 = 89. What is y?
  23. 23.Solve: 7m + 22 = 92. What is m?
  24. 24.Solve: 2m − 1 = 5. What is m?
  25. 25.Solve: 5y + 5 = 80. What is y?
  26. 26.Solve: 7(t + 8) = 112. What is t?
  27. 27.Solve: 6t + 5 = 71. What is t?
  28. 28.Solve: x/4 + 3 = 16. What is x?
  29. 29.Farhan is 3 years older than a cousin. Their ages add up to 29 years. How old is the cousin?
  30. 30.Tara is 4 years older than a cousin. Their ages add up to 12 years. How old is the cousin?
  31. 31.Solve: p/5 + 19 = 23. What is p?
  32. 32.Solve: 6m − 5 = 79. What is m?
  33. 33.Solve: n/5 + 4 = 16. What is n?
  34. 34.Solve: 4(m + 2) = 16. What is m?
  35. 35.Solve: x/6 + 10 = 20. What is x?
  36. 36.Solve: 3x − 5 = 19. What is x?
  37. 37.Solve: 9(p + 7) = 117. What is p?
  38. 38.Solve: 5n + 3 = 58. What is n?
  39. 39.Aditya is 3 years older than a cousin. Their ages add up to 11 years. How old is the cousin?
  40. 40.Solve: t/9 + 12 = 14. What is t?

Answer key

  1. 7
  2. 4
  3. 2
  4. 80
  5. 3
  6. 8
  7. 9
  8. 6
  9. 6
  10. 60
  11. 13
  12. 3
  13. 9
  14. 9
  15. 8
  16. 66
  17. 1
  18. 13
  19. 1
  20. 15
  21. 96
  22. 10
  23. 10
  24. 3
  25. 15
  26. 8
  27. 11
  28. 52
  29. 13
  30. 4
  31. 20
  32. 14
  33. 60
  34. 2
  35. 60
  36. 8
  37. 6
  38. 11
  39. 4
  40. 18

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