Grade 6 Mathematics · Unit 8: Equations & InequalitiesStandard 6.AT.8

Lesson 8.2Subtraction Equations

Apply Day · Set BSecond form · new problems, same idea

Mastery check☐ Exceeds☐ Meets target☐ Needs practice
Name Date Period

Learning target I can solve one-step addition and subtraction equations using inverse operations.

Remember8.2 · Part II

Solving Addition & Subtraction Equations

  1. Identify operation on variable
  2. Use inverse operation: subtract to undo addition; add to undo subtraction
  3. Property of Equality: do same operation to both sides

Words: Equation (Ecuación)Inverse operation (Operación inversa)Isolate (Despejar)Solution (Solución)One-step equation (Ecuación de un paso)

  1. 1Complete each step, then write the final answer.

    Solve x + 6 = 20.

    Show your work
    Final answer:
  2. 2Complete each step, then write the final answer.

    Solve n − 27 = 46.

    Show your work
    Final answer:
  3. 3Complete each step, then write the final answer.

    Solve 45 = k − 17.

    Show your work
    Final answer:
  4. 4Complete each step, then write the final answer.

    Some players were at the park. Then 13 players went home. Now 25 players are at the park. How many players were there at first?

    Show your work
    Final answer:
  5. 5Complete each step, then write the final answer.

    A store lowered the price of a jacket by $14.50. The new price is $39.99. Write and solve an equation. What was the old price?

    Show your work
    Final answer:
  6. 6Complete each step, then write the final answer.

    A box and a bag weigh 15.5 pounds together. The bag weighs 6.75 pounds. A crate weighs 4.3 pounds less than the box. How much does the crate weigh?

    Show your work
    Final answer:
  7. 7Circle the letter of the best answer. Show how you know.

    Solve: x + 9 = 15

    1. Ax = 6
    2. Bx = 9
    3. Cx = 15
    4. Dx = 24
    Show your work
  8. 8Circle the letter of the best answer. Show how you know.

    Solve: y − 7 = 20

    1. Ay = 7
    2. By = 13
    3. Cy = 27
    4. Dy = 140
    Show your work
  9. 9Circle the letter of the best answer. Show how you know.

    Solve: n + 15 = 42

    1. An = 15
    2. Bn = 27
    3. Cn = 42
    4. Dn = 57
    Show your work
How did it go? ☐ 4 · I can teach it☐ 3 · I've got it☐ 2 · I need a hint☐ 1 · I need help