← Simple equations lesson New set →

Class 7 Maths Worksheet: Simple Equations

Maths worksheets lesson 51: Simple equations · Set 381 · 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: 4x − 21 = 15. What is x?
  2. 2.Ananya’s mother is three times as old as Ananya. Their ages add up to 16 years. How old is Ananya?
  3. 3.Solve: y/3 + 4 = 9. What is y?
  4. 4.Solve: 5(n + 2) = 60. What is n?
  5. 5.Isha is 1 years older than a cousin. Their ages add up to 11 years. How old is the cousin?
  6. 6.Solve: 6p + 29 = 113. What is p?
  7. 7.Solve: y/7 + 2 = 9. What is y?
  8. 8.Solve: 4(y + 3) = 16. What is y?
  9. 9.Solve: 9y − 31 = 50. What is y?
  10. 10.Solve: 2m + 12 = 16. What is m?
  11. 11.Arjun is 8 years older than a cousin. Their ages add up to 18 years. How old is the cousin?
  12. 12.Meera’s mother is three times as old as Meera. Their ages add up to 32 years. How old is Meera?
  13. 13.Solve: 5x + 18 = 43. What is x?
  14. 14.Solve: 6m + 30 = 78. What is m?
  15. 15.Solve: 4x − 4 = 24. What is x?
  16. 16.Solve: 6n + 8 = 74. What is n?
  17. 17.Rahul is 4 years older than a cousin. Their ages add up to 16 years. How old is the cousin?
  18. 18.Solve: 9m − 22 = 14. What is m?
  19. 19.Solve: y/5 + 8 = 22. What is y?
  20. 20.Solve: 3t − 26 = 19. What is t?
  21. 21.Solve: 8(y + 3) = 88. What is y?
  22. 22.Solve: 5t + 2 = 72. What is t?
  23. 23.Saanvi is 5 years older than a cousin. Their ages add up to 27 years. How old is the cousin?
  24. 24.Solve: 6x + 15 = 105. What is x?
  25. 25.Solve: n/3 + 19 = 25. What is n?
  26. 26.Rahul’s mother is four times as old as Rahul. Their ages add up to 20 years. How old is Rahul?
  27. 27.Solve: 8(y + 2) = 64. What is y?
  28. 28.Solve: m/4 + 18 = 26. What is m?
  29. 29.Solve: 3x − 9 = 6. What is x?
  30. 30.Solve: 8x + 27 = 91. What is x?
  31. 31.Isha is 2 years older than a cousin. Their ages add up to 10 years. How old is the cousin?
  32. 32.Gurpreet is 1 years older than a cousin. Their ages add up to 9 years. How old is the cousin?
  33. 33.Solve: y/6 + 11 = 23. What is y?
  34. 34.Solve: 4t + 4 = 24. What is t?
  35. 35.Solve: 3y + 25 = 52. What is y?
  36. 36.Solve: p/9 + 4 = 10. What is p?
  37. 37.Solve: 3y − 13 = 32. What is y?
  38. 38.Rohan thinks of a number, multiplies it by 3 and then adds 30. The result is 72. What is the number?
  39. 39.Solve: 8(x + 2) = 48. What is x?
  40. 40.Solve: 5(n + 5) = 35. What is n?

Answer key

  1. 9
  2. 4
  3. 15
  4. 10
  5. 5
  6. 14
  7. 49
  8. 1
  9. 9
  10. 2
  11. 5
  12. 8
  13. 5
  14. 8
  15. 7
  16. 11
  17. 6
  18. 4
  19. 70
  20. 15
  21. 8
  22. 14
  23. 11
  24. 15
  25. 18
  26. 4
  27. 6
  28. 32
  29. 5
  30. 8
  31. 4
  32. 4
  33. 72
  34. 5
  35. 9
  36. 54
  37. 15
  38. 14
  39. 4
  40. 2

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