4-Digit Addition with Regrouping

Inside the case file

Christmas 4 digit addition with regrouping math activities for 3rd grade and 4th grade: five math worksheets in the Mystery Detective format, carrying across four columns throughout. Print and go with full answer keys, no prep, for December math centers, early finishers, homework, morning work and sub plans. Christmas math for 3rd grade and 4th grade that still does real work: 4 digit addition with regrouping, carrying across every column, inside a school Christmas mystery. Teachers use it as a December math center, a homework week or a Christmas math review, and one CSI Mini Mystery Detective download covers the week.

The last week before the break is when this one earns its place, and four digit addition with a secret Santa to find keeps a fourth grade class happily on the page right up to the bell. Every page is self-marking, and one CSI Mini Mystery Detective math case a day covers the week.

The Cases

1. Who is Secret Santa - a gift arrives with no name
2. Christmas Cheer - kindness turning up all December
3. Singing Christmas Carols - somebody is singing down the hall
4. Missing Xmas Present - a gift goes astray before Christmas
5. Turkey Trouble - nobody will carve the bird

What's Inside

• Five case files, each with a crime sheet and its own lineup of suspects
• Four digit addition with regrouping on every page
• Carrying across four columns, a step up from three digit work
• 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 puts a crime, a lineup and a page of math in front of your class, and the only way to name the culprit is to get the math right. Each suspect carries a number, each solved question matches one of them, and that suspect is crossed off until a single name remains. Because a wrong sum eliminates the wrong person, these detective activities make students check their work in a way math worksheets cannot.

When to Use This Resource

Use this in December once three digit carrying is secure, when you want the class moving on to four columns and you need it to happen without a fight. The Christmas setting buys you the attention and the math underneath is unchanged. A carry dropped in the thousands column names the wrong suspect, so students go back and check rather than waiting for the page to be graded.

Teachers use it for test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, with a class, a small group or one student.

Grade Levels

Written for 3rd grade and 4th grade, where four digit addition sits in the standards. Fifth graders take it as a quick refresher, and second graders manage it once three digit carrying is secure.

Why Teachers Love These Cases

• Moves the class up to four columns without a fight
• Students check their own work when the wrong suspect comes off
• No prep in December
• Works with a whole class, a small group, partners, or one student alone

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