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

Lesson 8.18.1 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 write an equation for a real situation and check whether a given value is a solution by substituting it, explain what each part stands for, and build one for a situation I have not seen before.

Remember8.1 Small Group · Group 2

A solution is the value that makes both sides of an equation equal, so always substitute it back into the equation to test it. Read the story carefully to write the right equation. Then test values to find the solution.

Words: Equation (Ecuación)Variable (Variable)Equal sign (Signo igual)Expression (Expresión)Constant (Constante)

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

    A box has some pencils. Students use 8 pencils. Now 12 pencils are left. Write an equation. Which value is the solution: 4, 20, or 96?

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

    Which value makes 8n = 56 true: 6, 7, or 48?

    Show your work
    Final answer:
  3. 3Circle the letter of the best answer. Show how you know.

    A recipe uses 3 cups of flour for each batch. Lee used 15 cups of flour. Which equation fits, and what is its solution?

    1. A3b = 15, so b = 5
    2. Bb + 3 = 15, so b = 12
    3. Cb ÷ 3 = 15, so b = 45
    4. D3b = 15, so b = 45
    Show your work
  4. 4Complete each step, then write the final answer.

    Which value is a solution of 2n + 5 = 21: 7, 8, or 13?

    Show your work
    Final answer:

Explain your thinkingOmar picked 6 by dividing the numbers he saw. Why must you substitute a value to know if it is a solution?

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