← Simple equations lesson New set →

Class 7 Maths Worksheet: Simple Equations

Maths worksheets lesson 51: Simple equations · Set 865 · 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: 8n + 24 = 32. What is n?
  2. 2.Nisha thinks of a number, multiplies it by 9 and then adds 20. The result is 155. What is the number?
  3. 3.Vivaan’s mother is four times as old as Vivaan. Their ages add up to 50 years. How old is Vivaan?
  4. 4.Solve: 7y + 8 = 36. What is y?
  5. 5.Solve: 3x + 10 = 46. What is x?
  6. 6.Solve: 3m − 15 = 12. What is m?
  7. 7.Solve: 8t − 4 = 4. What is t?
  8. 8.Solve: 9m − 16 = 20. What is m?
  9. 9.Solve: m/5 + 19 = 21. What is m?
  10. 10.Priya thinks of a number, multiplies it by 2 and then adds 15. The result is 27. What is the number?
  11. 11.Meera is 4 years older than a cousin. Their ages add up to 18 years. How old is the cousin?
  12. 12.Solve: 3t − 1 = 11. What is t?
  13. 13.Solve: 7x + 22 = 71. What is x?
  14. 14.Solve: 7y + 10 = 59. What is y?
  15. 15.Solve: m/8 + 1 = 9. What is m?
  16. 16.Zoya’s mother is twice as old as Zoya. Their ages add up to 12 years. How old is Zoya?
  17. 17.Solve: 8m + 17 = 33. What is m?
  18. 18.Isha’s mother is three times as old as Isha. Their ages add up to 44 years. How old is Isha?
  19. 19.Solve: 3(m + 3) = 48. What is m?
  20. 20.Solve: 8p + 8 = 96. What is p?
  21. 21.Solve: 2(t + 2) = 8. What is t?
  22. 22.Isha thinks of a number, multiplies it by 4 and then adds 9. The result is 29. What is the number?
  23. 23.Solve: 9m + 22 = 49. What is m?
  24. 24.Solve: 8x − 18 = 78. What is x?
  25. 25.Solve: 2m + 12 = 36. What is m?
  26. 26.Rahul thinks of a number, multiplies it by 8 and then adds 12. The result is 124. What is the number?
  27. 27.Meera’s mother is twice as old as Meera. Their ages add up to 39 years. How old is Meera?
  28. 28.Solve: 3p + 15 = 27. What is p?
  29. 29.Solve: 8y + 14 = 30. What is y?
  30. 30.Solve: 9x − 71 = 37. What is x?
  31. 31.Solve: 4m − 30 = 10. What is m?
  32. 32.Solve: 6x − 18 = 30. What is x?
  33. 33.Solve: t/3 + 11 = 14. What is t?
  34. 34.Solve: 3m + 30 = 63. What is m?
  35. 35.Sneha thinks of a number, multiplies it by 2 and then adds 21. The result is 37. What is the number?
  36. 36.Priya is 6 years older than a cousin. Their ages add up to 22 years. How old is the cousin?
  37. 37.Ananya is 3 years older than a cousin. Their ages add up to 19 years. How old is the cousin?
  38. 38.Kabir is 8 years older than a cousin. Their ages add up to 28 years. How old is the cousin?
  39. 39.Solve: t/3 + 15 = 17. What is t?
  40. 40.Solve: 7m + 12 = 117. What is m?

Answer key

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

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