Skip to content

Welcome guest

Please login or register
Skip to product information

Kiwiland Education

Expanded Form Place Value to 1000 | Mystery Detective Worksheets | Grades 2–3 | Detective

$4.00 USD

Expanded form activities, place value worksheets, and standard form practice for 2nd grade and 3rd grade are all included in this no-prep Mini Mystery Detective pack of math worksheets. Students write each number in standard form to eliminate suspects and unmask the villain across five detective cases - perfect for math centers, morning work, early finishers, sub days, and spiral review. Completely no prep - just print and go.

What's Inside

  • Writing numbers from expanded form into standard form: 300 + 40 + 2 becomes 342
  • Three-digit numbers to 1,000 - hundreds, tens and ones
  • Numbers with a missing place, so students have to hold the zero: 800 + 80 becomes 880, and 500 + 6 becomes 506
  • Expanded form written out of order, so students read the place value instead of copying digits left to right: 8 + 10 + 900
  • Place value names as well as numerals: 8 hundreds + 2 tens + 1 one
  • A final case that mixes every version together for review
  • Self-checking answer keys for every case

Five detective cases to solve: the locker mix-up, the mailbag muddle, the paint pot puzzle, the lunch box bungle, and the scoreboard slip. Answer keys included for every case.

What is a Mini Mystery Detective?

A no-prep detective activity where students solve math problems to cross off suspects and unmask the culprit. Every answer matches one suspect's ID number, so a correct page eliminates every suspect but one - the villain. Skill practice plus critical thinking in one engaging, self-checking worksheet set.

When to Use This Resource

  • Math centers and station rotations
  • Morning work and bell ringers
  • Early finishers
  • Sub days and emergency plans
  • Homework and spiral review
  • Small-group intervention
  • Whole-class warm-ups and test prep

Grade Levels

Designed for 2nd and 3rd graders. Also beneficial for struggling 4th graders who need to shore up three-digit place value and advanced 1st graders ready for a challenge beyond tens and ones.

Why Teachers Love Mystery Detectives

  • Zero prep - just print and hand out
  • Self-checking, so students spot their own mistakes before you do
  • The detective hook keeps the whole class on task
  • Builds real place value understanding alongside critical thinking
  • Works for the whole class, from strugglers to early finishers

Love this resource?

Follow Kiwiland Education to discover more Mystery Detectives, place value activities, and detective-themed stories for elementary classrooms.

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.



Expanded form worksheets 2nd grade mystery detective place value activity

Expanded Form Place Value to 1000 | Mystery Detective Worksheets | Grades 2–3 | Detective

$4.00

Your Cart

Your Wishlist