2-Digit Addition with Regrouping

Inside the case file

2 digit addition with regrouping Christmas math worksheets for 1st grade and 2nd grade, five December math sheets, each a Mystery Detective page short enough to finish in one sitting. No prep math activities with full answer keys, print and go, for math centers, morning work, early finishers, homework and sub plans. Christmas math for 1st grade and 2nd grade should be short, cheerful and real practice, and that is what this is: 2 digit addition with regrouping wrapped in a secret Santa story a young class wants to solve. It slots into December morning work or a Christmas math center, and every CSI Mini Mystery Detective page is self-marking.

A young class will do more addition for a mystery than for a worksheet, and these CSI Mini Mystery Detective math cases are short enough to prove it in one morning work slot. Each total a child finds rules a suspect out, so they finish the page to learn who the secret Santa is, and every page is self-marking.

The Cases

1. Who is Secret Santa - a gift arrives with no name
2. Christmas Chocolates - chocolates with no card attached
3. Carving the Turkey - nobody will pick up the knife
4. Acts of Kindness - someone is doing quiet good deeds
5. Christmas Carols & Songs - carols drifting down the hallway

What's Inside

• Five case files, each with a crime sheet and its own lineup of suspects
• Two digit addition with regrouping on every page
• Carrying on most problems, with room to write the ten above the column
• 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 gives your class a crime, a lineup and a page of questions, and the only route to the culprit runs through the math. Each suspect wears a number, each correct answer matches one of them, and that name is struck off until a single suspect is left. Because a wrong sum rules out the wrong person, these detective activities push students to check their work in a way math worksheets do not.

When to Use This Resource

December, and the last two weeks of term especially, when a first or second grade class has stopped sitting still and carrying still needs daily practice. One short case a day gets you through that stretch without handing out the same page twice. Forget the carry and the wrong suspect goes, which is a lesson a young child takes in faster than a red mark.

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

Grade Levels

Written for 1st grade and 2nd grade, where two digit addition with regrouping sits in the standards. Third graders take it as a December warm up, and first graders manage it once adding without carrying is secure.

Why Teachers Love These Cases

• One short case a day through the hardest two weeks to teach
• Students learn from a missed carry the moment the wrong name goes
• No prep when there is no time to prepare anything
• Works with a whole class, a small group, partners, or one student alone

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