Solving One-Step Equations

Inside the case file

Print and go one step equations worksheets for 6th grade and 7th grade math: five CSI Mini Mystery Detective cases where solving for the one variable clears a suspect until one name is left. Students solve equations with one variable across addition, subtraction, multiplication and division, so the pack covers the whole one step unit as algebra math activities and self-checking practice. Year round, with no season attached, for test prep, math centers, early finishers, homework, morning work and sub plans, and a full answer key for every case.

The first week of algebra is where students decide whether solving for x is a puzzle or a chore, and a suspect lineup tips it towards puzzle. Every equation they undo points at one name, so the whole class stays with the page and checks its own inverse operations without being told to. Use a CSI Mini Mystery Detective math case with everyone after the lesson, then keep the rest for small groups and early finishers.

The Cases

1. The Missing Car Keys - gone from the rack overnight
2. Snuggles - the neighbor's pet has vanished
3. The Missing Phone - it disappeared between classes
4. The Art Gallery Heist - a masterpiece walks out the door
5. The Bank Robbery - someone cleaned out the vault

What's Inside

• Five case files, each one a crime sheet of equations with its own lineup of suspects
• One step equations with a single variable, across adding, subtracting, multiplying and dividing
• Whole number answers, so no fractions or decimals slow the solving down
• Every answer matches one suspect and no other, so the page checks itself
• A full answer key for every case
• Print and go: no cutting, no laminating, nothing to set up the night before

What Is a CSI Mini Mystery Detective?

A CSI Mini Mystery Detective gives your class a crime, a lineup and a page of questions, and the only route to the culprit runs through the math. Each suspect wears a number, each correct answer matches one of them, and that name is struck off until a single suspect is left. Because a wrong solution rules out the wrong person, these detective activities push students to check their work in a way math worksheets do not.

When to Use This Resource

Use this once your class has met inverse operations and can solve for a variable in one move, either as the practice day straight after you teach it or as the review before the unit test. It fixes the thing every equations unit runs into: students who can do the math but will not stop to check the answer they wrote. Here a wrong solution crosses off the wrong suspect, so they catch the slip themselves before you grade a page.

Teachers use these case files for test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, with a whole class, a small group or one student alone.

Grade Levels

Written for 6th grade and 7th grade, where one step equations sit in the standards. Fifth graders take it as an introduction once inverse operations are taught, and 8th graders use it as a warm up before two step and multi-step equations.

Why Teachers Love These Cases

• One step only, so the focus stays on undoing the operation
• Students catch their own mistakes, because a wrong answer crosses off the wrong suspect
• No prep at all, and the answer keys make grading quick
• Suits a whole class, a small group, partners, or one student working alone
• Students ask to do these, which is rare for a page of equations

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