← Simple equations lesson New set →

Class 7 Maths Worksheet: Simple Equations

Maths worksheets lesson 51: Simple equations · Set 879 · 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: 3y + 20 = 38. What is y?
  2. 2.Solve: 7y − 6 = 1. What is y?
  3. 3.Sneha’s mother is twice as old as Sneha. Their ages add up to 36 years. How old is Sneha?
  4. 4.Solve: 3n − 4 = 5. What is n?
  5. 5.Vivaan is 6 years older than a cousin. Their ages add up to 18 years. How old is the cousin?
  6. 6.Nisha thinks of a number, multiplies it by 5 and then adds 3. The result is 38. What is the number?
  7. 7.Solve: 8m + 1 = 65. What is m?
  8. 8.Farhan’s mother is four times as old as Farhan. Their ages add up to 50 years. How old is Farhan?
  9. 9.Solve: 5t + 25 = 75. What is t?
  10. 10.Tara is 5 years older than a cousin. Their ages add up to 29 years. How old is the cousin?
  11. 11.Ananya is 7 years older than a cousin. Their ages add up to 21 years. How old is the cousin?
  12. 12.Rahul thinks of a number, multiplies it by 3 and then adds 12. The result is 30. What is the number?
  13. 13.Gurpreet thinks of a number, multiplies it by 8 and then adds 28. The result is 108. What is the number?
  14. 14.Solve: 8n + 7 = 95. What is n?
  15. 15.Karan is 7 years older than a cousin. Their ages add up to 23 years. How old is the cousin?
  16. 16.Solve: y/7 + 4 = 12. What is y?
  17. 17.Solve: t/4 + 17 = 30. What is t?
  18. 18.Priya thinks of a number, multiplies it by 4 and then adds 21. The result is 37. What is the number?
  19. 19.Dev is 3 years older than a cousin. Their ages add up to 31 years. How old is the cousin?
  20. 20.Solve: 9(n + 1) = 36. What is n?
  21. 21.Solve: y/2 + 5 = 8. What is y?
  22. 22.Rahul’s mother is twice as old as Rahul. Their ages add up to 39 years. How old is Rahul?
  23. 23.Solve: 8m + 27 = 99. What is m?
  24. 24.Kabir’s mother is four times as old as Kabir. Their ages add up to 35 years. How old is Kabir?
  25. 25.Solve: 5x − 27 = 8. What is x?
  26. 26.Ananya thinks of a number, multiplies it by 4 and then adds 22. The result is 82. What is the number?
  27. 27.Solve: 8p − 7 = 73. What is p?
  28. 28.Nisha thinks of a number, multiplies it by 4 and then adds 20. The result is 52. What is the number?
  29. 29.Solve: 7m + 21 = 35. What is m?
  30. 30.Solve: 9x + 1 = 37. What is x?
  31. 31.Solve: t/6 + 8 = 12. What is t?
  32. 32.Solve: 5(x + 5) = 100. What is x?
  33. 33.Solve: 3y − 5 = 4. What is y?
  34. 34.Meera thinks of a number, multiplies it by 7 and then adds 5. The result is 82. What is the number?
  35. 35.Manav is 8 years older than a cousin. Their ages add up to 24 years. How old is the cousin?
  36. 36.Dev thinks of a number, multiplies it by 6 and then adds 5. The result is 47. What is the number?
  37. 37.Solve: 4y + 20 = 48. What is y?
  38. 38.Rahul thinks of a number, multiplies it by 2 and then adds 26. The result is 50. What is the number?
  39. 39.Solve: 2t − 11 = 3. What is t?
  40. 40.Ishaan thinks of a number, multiplies it by 2 and then adds 12. The result is 40. What is the number?

Answer key

  1. 6
  2. 1
  3. 12
  4. 3
  5. 6
  6. 7
  7. 8
  8. 10
  9. 10
  10. 12
  11. 7
  12. 6
  13. 10
  14. 11
  15. 8
  16. 56
  17. 52
  18. 4
  19. 14
  20. 3
  21. 6
  22. 13
  23. 9
  24. 7
  25. 7
  26. 15
  27. 10
  28. 8
  29. 2
  30. 4
  31. 24
  32. 15
  33. 3
  34. 11
  35. 8
  36. 7
  37. 7
  38. 12
  39. 7
  40. 14

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