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Kiwiland Education

Slope From Two Points | Mystery Detective Worksheets | Grades 7–9 | Formula Practice

$4.00 USD

Slope formula practice, finding slope from two points, and rate of change worksheets for 7th grade, 8th grade, and 9th grade are all included in this printable Mini Mystery Detective pack of math worksheets. Students use the slope formula on every clue, then match their answers to the suspect list and cross names off until one villain is left standing. Perfect for math centers, early finishers, sub plans, homework, unit review, and Algebra 1 warm-ups. Completely no prep - just print and go.

What's Inside

  • Using the slope formula on pairs of coordinates, working up from friendly first-quadrant points to points in all four quadrants
  • Subtracting negative numbers inside the formula, like the line through (-9, -12) and (15, 3)
  • Negative slopes, positive slopes, whole-number slopes and fraction slopes, always written in simplest form
  • A zero slope, so students meet a line that is perfectly flat and see why the answer is 0 rather than nothing
  • Pairs written in reverse order, so students find out for themselves that the order of the points does not change the slope
  • Self-checking pages - every correct answer crosses off exactly one suspect, so a slip shows up straight away

Five cases to solve: The Survey Pegs, The Falling Tide, The Mine Shaft Log, The Satellite Grid, and The Cold Case File. Twenty problems on every page, and answer keys included for all of them.

What is a Mini Mystery Detective?

A no-prep detective activity where students solve math problems to cross off suspects and unmask the culprit. Skill practice plus critical thinking in one engaging, self-checking worksheet set.

When to Use This Resource

  • Math centers and stations
  • Early finishers
  • Sub plans and emergency days
  • Homework and independent practice
  • Unit review and test prep
  • Small group and intervention work
  • Algebra 1 warm-ups and back-to-school review

Grade Levels

Designed for 8th grade, where the slope formula is taught. Also beneficial for 7th graders who are ready to move on from unit rate, and for 9th graders who need solid practice with signed numbers before linear equations in Algebra 1.

Why Teachers Love Mystery Detectives

  • Zero prep - print and hand out
  • Self-checking, so you are not marking a class set to find out who understood it
  • The detective hook keeps students working through twenty problems instead of five
  • Real rigor - negative coordinates and negative answers, not just easy first-quadrant pairs
  • The cases build in order, so one page introduces one new difficulty at a time

Love this resource?

Follow Kiwiland Education to discover more Mystery Detectives, CSI Mystery Detectives, and detective-themed activities for middle school and Algebra classrooms.

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Kiwiland Education

All of our products are digital downloads — no physical items will be shipped.

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How Math Mysteries Work

Each Math Mystery resource gives you five one-page cases that turn math practice into a clue-based investigation. Here's exactly how a case plays out.

CASE FILE 5 MYSTERIES

Every set is a ready-to-solve investigation

Students become the math detective. They read a story, crunch the numbers, and use their answers as evidence to rule out suspects — until only the culprit is left standing.

1
STEP 01

Read the Case

Each mystery opens with a short, themed story that sets the scene and tells students exactly what they're trying to find out — who took something, what went missing, or what really happened.

Hooks them in seconds
2
STEP 02

Solve the Problems

Students work through a set of problems built around the target skill. Every answer is a clue — so there's a real reason to get each one right.

Focused skill practice
3
STEP 03

Eliminate Suspects

Students match their answers against the suspect list and cross off names one clue at a time. Wrong math means the wrong suspect — so the activity self-checks as they go.

Self-checking built in
4
STEP 04

Crack the Case

One suspect is left — and students reveal who did it. The payoff makes review feel like a win, and they're ready to start the next case.

The satisfying reveal

See it in action

SOLVE A CLUEAnswer = 576
→
MATCH THE ANSWER576 = Bianca
→
CROSS OFFBianca
No apps. No logins. No prep. Just print, hand out, and let them investigate.

New to the format? Read What Is a Math Mystery? for how they work and how to run one in class.

Why Teachers Use Math Mysteries

Skill practice that feels like a case worth solving — and a download that quietly does a lot of your planning for you.

5one-page cases per set
0prep or setup time
color & black-and-white
answer keys included

Five Mysteries in One

Every download includes five separate one-page cases — enough for a full week of practice, a center rotation, or a sub-day backup that's always ready to go.

Truly No-Prep

No cutting, laminating, apps, or logins. Print in full color or black-and-white and hand them straight out — that's the whole setup.

Self-Checking by Design

Students need the right answers to rule out the right suspects, so accuracy matters — and the included answer keys mean no grading for you.

Fits Any Routine

Use one case as a morning warm-up, or spread the five across the week for centers, partner work, early finishers, or intervention.

Keeps Students Hooked

The mystery format gives even reluctant mathematicians a reason to keep solving. Review starts to feel like a game, not another worksheet.

Differentiation-Friendly

Great for on-level practice, an extension for advanced students, or a targeted review pass for anyone who needs another go at the skill.

NO PREP PRINT & GO ANSWER KEYS INCLUDED

What's in every Math Mystery set

5 full-color mysteries 5 black-and-white versions 5 complete answer keys Print-and-go teacher page Bonus coloring page
Practice that feels like a case worth cracking.

Frequently Asked Questions About Math Mysteries

Printable Math Mystery worksheets that turn math practice into clue-based detective investigations.

Is this Math Mystery a digital activity?

No. This is a printable PDF resource. Students complete the Math Mystery on paper. No physical item will be shipped.

Do students need apps, locks, passwords, or logins?

No. Students do not need apps, locks, passwords, or logins. Teachers can print the pages and use the Math Mystery straight away.

How do students solve the Math Mystery?

Each resource includes five one-page cases. In each one, students solve the math problems and use their answers to eliminate suspects until only one remains and the case is cracked.

Can this Math Mystery be used for sub plans?

Yes. Math Mysteries work well for sub plans because students can work through the clues independently, with a partner, or in small groups.

Can this Math Mystery be used for homeschool?

Yes. This printable Math Mystery can be used for homeschool lessons, tutoring, review practice, enrichment, or extra math support.

Will this work for early finishers or math centers?

Yes. Math Mysteries are a good fit for early finishers, math centers, small groups, independent work, review lessons, and extra practice activities.



Slope formula worksheets finding slope from two points 8th grade

Slope From Two Points | Mystery Detective Worksheets | Grades 7–9 | Formula Practice

$4.00

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