2-Digit Subtraction with Regrouping

Inside the case file

Christmas 2 digit subtraction with regrouping math worksheets for 1st grade and 2nd grade: five short Mystery Detective math case files a young class can finish. Print and go with full answer keys, no prep, for December math centers, morning work, early finishers, homework and sub plans. A secret Santa, an elf and a few missing candy canes make this the December subtraction practice a 1st grade or 2nd grade class will happily finish. It is Christmas math with regrouping underneath, ready for math centers, morning work or the last week of term, with a CSI Mini Mystery Detective story on every page.

The last two weeks of term are when a young class needs a reason to sit and subtract, and a secret Santa to unmask is that reason. One CSI Mini Mystery Detective math case fits a morning work slot, and every page marks itself, with answer keys included.

The Cases

1. Class Secret Santa - a gift with no name on the tag
2. Christmas Presents - who gets to unwrap first
3. Christmas Carols & Songs - carols drifting down the hallway
4. Missing Candy Canes - stripped straight off the tree
5. Christmas Elf - an elf leaves a gift for somebody

What's Inside

• Five case files, each with a crime sheet and its own lineup of suspects
• Two digit subtraction with regrouping on every page
• Borrowing on most problems, so the skill actually gets practiced
• Each answer matches one suspect and no other, so the page checks itself
• A full answer key for every case
• Print and go: no cutting, no laminating, nothing to prepare

What Is a CSI Mini Mystery Detective?

A CSI Mini Mystery Detective is a single page case your class cracks with math. The suspects stand in a lineup with a number each, the crime sheet produces those numbers, and a correct answer knocks one suspect out until the last name standing is the culprit. There is no kit and nothing to assemble, so what carries it is the arithmetic, which is what makes detective activities land where math worksheets slide off.

When to Use This Resource

These are for the last two weeks of term, when borrowing still needs work and the class has one eye on the holidays. Five short cases give you something for each of those days that is genuine subtraction practice rather than a coloring page with sums on it. A child who subtracts the smaller digit from the larger one names the wrong suspect and finds out immediately.

It suits test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, with a class, a small group or one child alone.

Grade Levels

Written for 1st grade and 2nd grade, where two digit subtraction with regrouping sits in the standards. Third graders take it as a December refresher, and first graders manage it once subtracting without borrowing is secure.

Why Teachers Love These Cases

• Real borrowing practice, not a festive page with a few sums on it
• Students catch the classic subtraction habit as the wrong name goes
• No prep in the last two weeks of term
• Works with a whole class, a small group, partners, or one student alone

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