L18 · Write and solve multi-step equations

1. 1.

   Solve 5x + 8 = 53.

   Answer. x = 9

   Subtract 8: 5x = 45. Divide by 5: x = 9.

2. 2.

   Solve 6x + 4 = 34.

   Answer. x = 5

   Subtract 4: 6x = 30. Divide by 6: x = 5.

3. 3.

   Solve 4x + 4 = 24.

   Answer. x = 5

   Subtract 4: 4x = 20. Divide by 4: x = 5.

4. 4.

   Solve 5x + 8 = 38.

   Answer. x = 6

   Subtract 8: 5x = 30. Divide by 5: x = 6.

5. 5.

   Solve 3x + 4 = 25. Write a complete answer — Sam will compare with a partner.

   Answer. x = 7

   Subtract 4: 3x = 21. Divide by 3: x = 7.

6. 6.

   Solve 6x + 7 = 61. Write a complete answer — Elena will compare with a partner.

   Answer. x = 9

   Subtract 7: 6x = 54. Divide by 6: x = 9.

7. 7.

   Solve 2x + 7 = 15. Write a complete answer — Priya will compare with a partner.

   Answer. x = 4

   Subtract 7: 2x = 8. Divide by 2: x = 4.

8. 8.

   Solve 3x + 5 = 23. Write a complete answer — Mei will compare with a partner.

   Answer. x = 6

   Subtract 5: 3x = 18. Divide by 3: x = 6.

9. 9.

   Solve 4x + 6 = 38. Write a complete answer — Nora will compare with a partner.

   Answer. x = 8

   Subtract 6: 4x = 32. Divide by 4: x = 8.

10. 10.

    Solve 4x + 7 = 43. Write a complete answer — Ava will compare with a partner.

    Answer. x = 9

    Subtract 7: 4x = 36. Divide by 4: x = 9.

11. 11.

    Think

    Priya tried this problem:
    Solve 5x + 2 = 47.
    Priya wrote x = 8. That is not correct. What is the right answer?

    Answer. x = 9

    Priya’s answer x = 8 is off. Subtract 2: 5x = 45. Divide by 5: x = 9.

12. 12.

    Think

    Grace tried this problem:
    Solve 2x + 4 = 22.
    Grace wrote x = 8. That is not correct. What is the right answer?

    Answer. x = 9

    Grace’s answer x = 8 is off. Subtract 4: 2x = 18. Divide by 2: x = 9.

Original extra practice. Keys are computed from the items, not guessed.