Mississippi Math FA.A.8

MathGrades 9–12Algebra (A) Equations and Inequalities

The Standard

Solve word problems leading to equations of the form px + q = r and p(x + q) = r, where p, q, and r are specific rational numbers. Solve equations of these forms fluently. (7.EE.4a)

2025 Mississippi College- and Career-Readiness Standards for Mathematics

Teacher's field guide

What This Standard Means

What Students Need to Do: Students turn word problems into equations with an unknown amount, a multiplier, and an added amount. They solve the equations and check whether their answers fit the story, including when amounts are fractions or decimals.
What Mastery Looks Like: A student can tell whether a fee is added once or added to every item. They write the matching equation, solve it, and check their answer in the story.
Common Misconceptions: Students may write 3(x + 2) when a $2 fee is charged only once. They may divide before subtracting in 3x + 2 = 14, or forget to multiply the 2 in 3(x + 2).
How to Assess It: Exit ticket: Three identical notebooks each need a $1.50 cover, and the total is $9. Write and solve an equation for one notebook, then explain why 3x + 1.50 = 9 does not fit.

Lesson moves

Ways to Teach It

Give pairs three paper cups, each holding an x card and a $1.50 card; have them model a $9 total and solve for x.
Ask students to explain why 2(x + 5) = 17 is wrong if a driver charges $2 per mile plus $5 once.
Play equation match: pairs match half-price ticket and fixed-fee story cards to equations, then solve and check answers on the back.
Use a takeout receipt with three equal-price meals and one $2.40 delivery charge; find each meal's price from a $20.40 total.

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