← Simple equations lesson New set →

Class 7 Maths Worksheet: Simple Equations

Maths worksheets lesson 51: Simple equations · Set 351 · 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.Dev is 6 years older than a cousin. Their ages add up to 18 years. How old is the cousin?
  2. 2.Solve: p/6 + 4 = 7. What is p?
  3. 3.Diya thinks of a number, multiplies it by 8 and then adds 10. The result is 114. What is the number?
  4. 4.Solve: 3(m + 7) = 51. What is m?
  5. 5.Solve: 5y + 4 = 79. What is y?
  6. 6.Solve: 5(n + 7) = 65. What is n?
  7. 7.Solve: 4m − 4 = 16. What is m?
  8. 8.Solve: 5x + 22 = 57. What is x?
  9. 9.Solve: 4t − 7 = 5. What is t?
  10. 10.Solve: 7y − 39 = 31. What is y?
  11. 11.Solve: 9m + 29 = 137. What is m?
  12. 12.Solve: 8n − 8 = 16. What is n?
  13. 13.Gurpreet thinks of a number, multiplies it by 3 and then adds 7. The result is 52. What is the number?
  14. 14.Solve: m/2 + 10 = 13. What is m?
  15. 15.Sneha is 1 years older than a cousin. Their ages add up to 31 years. How old is the cousin?
  16. 16.Pooja thinks of a number, multiplies it by 7 and then adds 9. The result is 37. What is the number?
  17. 17.Solve: 2(t + 3) = 12. What is t?
  18. 18.Solve: 6p + 7 = 73. What is p?
  19. 19.Dev’s mother is twice as old as Dev. Their ages add up to 24 years. How old is Dev?
  20. 20.Solve: 8(x + 2) = 40. What is x?
  21. 21.Solve: 9(t + 8) = 108. What is t?
  22. 22.Priya’s mother is four times as old as Priya. Their ages add up to 40 years. How old is Priya?
  23. 23.Lakshmi’s mother is three times as old as Lakshmi. Their ages add up to 24 years. How old is Lakshmi?
  24. 24.Solve: y/5 + 13 = 22. What is y?
  25. 25.Solve: 4t − 13 = 35. What is t?
  26. 26.Solve: t/9 + 11 = 12. What is t?
  27. 27.Solve: n/6 + 5 = 6. What is n?
  28. 28.Solve: m/8 + 1 = 9. What is m?
  29. 29.Solve: 9t + 25 = 124. What is t?
  30. 30.Riya thinks of a number, multiplies it by 8 and then adds 25. The result is 81. What is the number?
  31. 31.Solve: 7(x + 2) = 112. What is x?
  32. 32.Solve: y/4 + 13 = 27. What is y?
  33. 33.Solve: 3x + 26 = 38. What is x?
  34. 34.Solve: m/5 + 15 = 20. What is m?
  35. 35.Diya is 7 years older than a cousin. Their ages add up to 21 years. How old is the cousin?
  36. 36.Kabir is 6 years older than a cousin. Their ages add up to 32 years. How old is the cousin?
  37. 37.Solve: 8(n + 4) = 120. What is n?
  38. 38.Solve: 3y − 5 = 7. What is y?
  39. 39.Solve: 4(t + 3) = 36. What is t?
  40. 40.Solve: 9t + 20 = 146. What is t?

Answer key

  1. 6
  2. 18
  3. 13
  4. 10
  5. 15
  6. 6
  7. 5
  8. 7
  9. 3
  10. 10
  11. 12
  12. 3
  13. 15
  14. 6
  15. 15
  16. 4
  17. 3
  18. 11
  19. 8
  20. 3
  21. 4
  22. 8
  23. 6
  24. 45
  25. 12
  26. 9
  27. 6
  28. 64
  29. 11
  30. 7
  31. 14
  32. 56
  33. 4
  34. 25
  35. 7
  36. 13
  37. 11
  38. 4
  39. 6
  40. 14

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