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Kiwiland Education

3-Digit Addition with Regrouping | Halloween Math Mystery | Grades 2–4 | Detective Mystery

$4.00 USD

3-digit addition with regrouping goes spooky this Halloween: one of the teachers around the school is secretly a witch, and only your sharpest adders can unmask her. In this no-prep, printable Halloween Math Mystery, students solve 3-digit addition with regrouping problems, match each sum to a teacher on the suspect list, and eliminate suspects one by one until only the witch remains. The self-checking, story-driven format builds real addition fluency while keeping 2nd, 3rd, and 4th graders engaged — a perfect Halloween activity for math centers, morning work, homework, early finishers, substitute/relief days, indoor recess, and spiral review.

Quick Details

  • Skill: 3-digit addition with regrouping (carrying)
  • Grades: 2–4 (2nd, 3rd, 4th)
  • Format: 5 differentiated no-prep mystery worksheets in full color and black & white + suspect lists + full answer keys (PDF)
  • Theme: Halloween — Who Is the Witch?

The Mystery: Who Is the Witch?

One of the teachers around the school is secretly a witch. Students solve the 3-digit addition problems, match each answer to the suspect clue list, and eliminate teachers one by one until only the witch is left. Five differentiated worksheets are included — each with its own set of problems and its own suspect list — so you can re-use the activity across the week, assign different versions to different groups, or hand out alternating versions to keep everyone honest:

  • Worksheet 1–5 — five separate "Who is the Witch?" cases, each a self-contained page of 3-digit addition with its own teacher suspects to eliminate.

Why Teachers Love It

  • Zero prep — just print and hand out; a print-friendly black & white version is included too.
  • Self-checking — the suspect-elimination format means students catch their own mistakes and stay accountable.
  • Engagement that lasts — the spooky witch hunt pulls in even reluctant and struggling students.
  • Differentiation-friendly — five ready-to-go versions make it easy to re-use, differentiate, or prevent copying.

Skills Covered

  • Adding 3-digit numbers with regrouping (carrying)
  • Place value and column addition
  • Addition fact fluency and accuracy
  • Logical reasoning and deductive process of elimination

What's Included

  • 5 print-and-go "Who is the Witch?" mystery worksheets, in full color and black & white
  • Matching teacher suspect lists
  • Full answer keys
  • Student detective instructions

Best Used For

Halloween math, October math centers, independent practice, morning work, homework, early finishers, substitute/relief days, indoor recess, and spiral review — any time you want 3-digit addition practice that feels like a game.

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.

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.



Halloween 3-digit addition with regrouping Math Mystery worksheets, jack-o-lantern detective cover grades 2-4

3-Digit Addition with Regrouping | Halloween Math Mystery | Grades 2–4 | Detective Mystery

$4.00

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