3-Digit Addition with Regrouping

Inside the case file

Christmas 3 digit addition with regrouping worksheets for 2nd grade and 3rd grade, five math cases, each a Mystery Detective page of column sums. Print and go with full answer keys: math worksheets and CSI Mini Mystery Detective cases in one, no prep, for morning work, math centers, early finishers, homework and sub plans. The whole pack is built around a school Christmas, from the secret Santa to the staffroom lunch, so 2nd grade and 3rd grade students get 3 digit addition with regrouping practice that feels like part of the season. Use it as Christmas math activities for the last fortnight, a December math center or a self-marking homework set.

The last fortnight before the Christmas break is when a secret Santa to unmask turns a page of sums into the addition practice a class asks for. Because each total has to match a clue, the pages mark themselves. One CSI Mini Mystery Detective math case a day covers the fortnight's mornings.

An elf has left a present, somebody made the teachers a Christmas lunch, and the family needs someone to carve the turkey. Students carry across the columns to find each total, then cross off the clue it matches. It keeps addition practice going through the last weeks before break.

The Cases

1. Christmas Turkey - who's carving the turkey
2. Secret Santa - a gift on the teacher's desk
3. Christmas Kindness - good deeds at Christmas
4. Christmas Lunch - lunch made for the teachers
5. Christmas Elf - who the elf's present is for

What's Inside

• Five Christmas cases of 3 digit addition with regrouping
• Black and white copies
• An answer key for every case
• Problems laid out in columns
• A teacher instruction page

What Is a CSI Mini Mystery Detective?

A CSI Mini Mystery Detective puts a short Christmas story, a set of addition problems and some clue lists on one page. Students cross off the clues their answers match. The clues that remain solve the case.

When to Use This Resource

These are for December. 2nd graders can use them at the end of the addition unit, and 3rd graders as review. They work as homework, early finisher work, sub plans or a class party activity.

Grade Levels

Best for 2nd grade and 3rd grade.

Why Teachers Love These Cases

• Christmas stories
• Regrouping in every problem
• No prep
• Students can check their own totals

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