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

Lesson 8.28.2 Small Group · Group 2

Group 2 · Set BSecond challenge form · new problems, same idea

Mastery check☐ Exceeds☐ Meets target☐ Needs practice
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Learning target I can solve one-step addition and subtraction equations using inverse operations, explain why the method works, and use it on a problem I have not seen before.

Remember8.2 Small Group · Group 2

Use the story to decide what was done to the unknown, then undo it on both sides and check that the answer makes sense. Write the equation from the story first. The story tells you which operation to undo.

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.

    Leo had some money. He spent $6.40 on lunch. Now he has $13.85. Write and solve an equation. How much money did Leo have at first?

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

    Solve n − 6.25 = 13.5.

    Show your work
    Final answer:
  3. 3Complete 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:
  4. 4Complete 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:

Explain your thinkingDoes your plan change when the numbers are decimals or the variable is on the right side? Explain with 45 = k − 17.

How did it go? ☐ 4 · I can teach it☐ 3 · I've got it☐ 2 · I need a hint☐ 1 · I need help