← Simple equations lesson New set →

Class 7 Maths Worksheet: Simple Equations

Maths worksheets lesson 51: Simple equations · Set 789 · 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 + 3 = 11. What is m?
  2. 2.Solve: 5n + 24 = 79. What is n?
  3. 3.Sneha thinks of a number, multiplies it by 7 and then adds 21. The result is 119. What is the number?
  4. 4.Solve: 9(m + 4) = 117. What is m?
  5. 5.Isha thinks of a number, multiplies it by 5 and then adds 9. The result is 69. What is the number?
  6. 6.Meera thinks of a number, multiplies it by 3 and then adds 7. The result is 31. What is the number?
  7. 7.Solve: 2y + 17 = 19. What is y?
  8. 8.Rohan is 1 years older than a cousin. Their ages add up to 9 years. How old is the cousin?
  9. 9.Solve: 8x + 16 = 56. What is x?
  10. 10.Solve: 7p − 1 = 27. What is p?
  11. 11.Solve: 6(m + 3) = 90. What is m?
  12. 12.Solve: 3x − 3 = 42. What is x?
  13. 13.Solve: 2n + 30 = 46. What is n?
  14. 14.Aarav is 3 years older than a cousin. Their ages add up to 17 years. How old is the cousin?
  15. 15.Solve: 8m − 39 = 65. What is m?
  16. 16.Solve: 8(x + 2) = 104. What is x?
  17. 17.Solve: 2(m + 1) = 28. What is m?
  18. 18.Solve: 9(m + 2) = 27. What is m?
  19. 19.Solve: 2p − 2 = 4. What is p?
  20. 20.Solve: 6(n + 1) = 30. What is n?
  21. 21.Solve: 7(p + 9) = 70. What is p?
  22. 22.Solve: 7x + 5 = 26. What is x?
  23. 23.Solve: 3p − 2 = 1. What is p?
  24. 24.Isha’s mother is four times as old as Isha. Their ages add up to 75 years. How old is Isha?
  25. 25.Solve: 4p − 1 = 3. What is p?
  26. 26.Solve: 6p + 17 = 59. What is p?
  27. 27.Sneha’s mother is four times as old as Sneha. Their ages add up to 75 years. How old is Sneha?
  28. 28.Solve: x/4 + 11 = 14. What is x?
  29. 29.Solve: y/5 + 9 = 18. What is y?
  30. 30.Solve: 3(t + 5) = 33. What is t?
  31. 31.Solve: 8m − 10 = 14. What is m?
  32. 32.Solve: p/7 + 13 = 21. What is p?
  33. 33.Riya’s mother is four times as old as Riya. Their ages add up to 50 years. How old is Riya?
  34. 34.Solve: 7x + 25 = 53. What is x?
  35. 35.Solve: 7p − 14 = 70. What is p?
  36. 36.Solve: 5(n + 5) = 100. What is n?
  37. 37.Solve: 9x − 44 = 64. What is x?
  38. 38.Kabir thinks of a number, multiplies it by 4 and then adds 23. The result is 31. What is the number?
  39. 39.Solve: p/3 + 9 = 17. What is p?
  40. 40.Rohan thinks of a number, multiplies it by 4 and then adds 21. The result is 73. What is the number?

Answer key

  1. 72
  2. 11
  3. 14
  4. 9
  5. 12
  6. 8
  7. 1
  8. 4
  9. 5
  10. 4
  11. 12
  12. 15
  13. 8
  14. 7
  15. 13
  16. 11
  17. 13
  18. 1
  19. 3
  20. 4
  21. 1
  22. 3
  23. 1
  24. 15
  25. 1
  26. 7
  27. 15
  28. 12
  29. 45
  30. 6
  31. 3
  32. 56
  33. 10
  34. 4
  35. 12
  36. 15
  37. 12
  38. 2
  39. 24
  40. 13

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