Skip to content

Welcome guest

Please login or register
Skip to product information

Kiwiland Education

4-Digit Subtraction with Regrouping | Mystery Detective Worksheets | Grades 2–5 | Printable Detective Pack

$4.00 USD

4 digit subtraction with regrouping math activities for 3rd grade and 4th grade: five math cases in the Mystery Detective format, borrowing across four columns on every page. Print and go with full answer keys: no prep math worksheets for morning work, math centers, early finishers, homework and sub plans. Four digit subtraction with regrouping for 3rd grade and 4th grade, set around school so it fits any month, and the borrowing practice a class needs before moving on. It suits math centers, homework and 4th grade math review, and a CSI Mini Mystery Detective marks itself.

Borrowing across four columns is the skill that carries the whole multi digit unit, and a prize with no winner named is what gets the practice done with a smile. The lineup does the checking, so the marking is student-led. One CSI Mini Mystery Detective math case a day covers the week.

Some problems need a borrow in one place and others need it in two or three. Students work each one, then cross off the matching clue in four lists: who, where, when and what. The stories include fruit missing from a lunch box and a library book that never came back.

 

The Cases

  1. Mystery Present - a gift with no name on it
  2. Acts of Kindness - good deeds around the school
  3. The Missing Fruit - fruit gone from a lunch box
  4. Student Prize - who won the prize
  5. The Missing Book - a library book not returned

 

What's Inside

  • Five cases of 4 digit subtraction with regrouping
  • Four clue lists on each page
  • Black and white copies of every case
  • Answer keys
  • A teacher instruction page

 

What Is a CSI Mini Mystery Detective?

Students read a short crime story, solve the subtraction and cross off clues that match their answers. Each clue has a number beside it. By the end, one clue is left in every list, and that's the solution.

 

When to Use This Resource

These work after 4 digit subtraction has been taught, and as a start-of-year check in 4th grade. Try them in a math center, with a small group, on a sub day or in homeschool.

 

Grade Levels

For 3rd grade and 4th grade classes.

 

Why Teachers Love These Cases

  • Borrowing across four places
  • Print and go
  • Students catch their own mistakes
  • School stories

 

Want more cases like these?

Follow Kiwiland Education to discover more CSI Mini Mystery Detective cases, no-prep math activities, and detective-themed printables for elementary classrooms.

Follow Kiwiland Education on TPT ↗

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

  • After purchase, you’ll receive an email with a download link within minutes.
  • Make sure to check your spam or promotions folder if you don't see it right away.
  • If you experience any issues accessing your files, please contact us and we’ll help you promptly.

Due to the nature of digital products, all sales are final.

We do not offer refunds or exchanges once a file has been downloaded.

However, if you encounter any problems with your download or the product itself, please reach out — we're happy to assist.

  • Thank you from Kiwiland Education

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.



4-digit subtraction with regrouping worksheets 3rd 4th grade

4-Digit Subtraction with Regrouping | Mystery Detective Worksheets | Grades 2–5 | Printable Detective Pack

$4.00

Your Cart

Your Wishlist