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Kiwiland Education

Addition & Subtraction Word Problems Within 100 | Mystery Detective Worksheets | Grades 1–3

$4.00 USD

Addition and subtraction word problems, two-digit story problem worksheets, and add and subtract within 100 practice for 1st grade, 2nd grade, and 3rd grade are all included in this school-themed Mini Mystery Detective pack of math worksheets. Students solve one-step word problems to crack five detective cases, matching every answer to a suspect and crossing that suspect off until only the villain is left standing. Completely no prep - just print and go.

Use it as a two-digit addition and subtraction review, a regrouping and borrowing practice set, a no-prep math sub plan, a spiral review before a unit test, a homework packet, or a station in your math centers. The problems cover adding to, taking from, putting together, taking apart and comparing, so students have to work out which operation the story is really asking for instead of repeating the same move all the way down the page.

What's Inside

  • Solving one-step addition word problems within 100 - joining situations (the shelf held 43 crayons and the teacher added 18 more) and putting-together situations (55 big canvases and 11 small canvases)
  • Solving one-step subtraction word problems within 100 - taking-away situations (73 sheets of paper and Room 2 used 38) and comparing situations (86 pencils and 40 pens, how many fewer pens)
  • Working out which operation a story calls for when no key word gives it away, which is exactly where comparing problems catch students out
  • Adding and subtracting two-digit numbers with and without regrouping and borrowing
  • Reading a word problem carefully and pulling the two numbers that matter out of it
  • Checking their own work - a wrong answer leaves two suspects standing, so students know to go back and find it themselves
  • Every page provided ready to print with no preparation

Five school mysteries to solve: the paint pot puzzle, the empty seed tray, the silent stage, the late school bus and the playground prank. 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 suspect wears an ID badge, and each correct answer matches one of them - so solving the page eliminates them one at a time until a single suspect is left. Skill practice plus critical thinking in one engaging, self-checking worksheet set.

When to Use This Resource

  • Math centers and rotations
  • Morning work and warm-ups
  • Early finishers
  • Sub days and emergency plans
  • Homework
  • Spiral review and test prep
  • Small-group intervention
  • Whole-class problem solving

Grade Levels

Designed for 2nd graders. Also beneficial for struggling 3rd graders who need extra practice with word problems and advanced 1st graders ready for a challenge.

Why Teachers Love Mystery Detectives

  • Zero prep - just print and hand it out
  • Self-checking, so students spot their own mistakes instead of waiting to be marked
  • The detective hook keeps the whole class on task, including the students who usually stall on word problems
  • Real skill practice, not busy work - every case is a full page of problem solving
  • All four addition and subtraction situation types on every page, so no student can coast on one strategy
  • Answer keys make marking quick

Love this resource?

Follow Kiwiland Education to discover more Mystery Detectives, word problem worksheets, and detective-themed stories for elementary classrooms.

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

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

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

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  • 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.



Addition and subtraction word problems 2nd grade mystery detective worksheets

Addition & Subtraction Word Problems Within 100 | Mystery Detective Worksheets | Grades 1–3

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