4-Digit Addition with Regrouping

Inside the case file

4 digit addition with regrouping math worksheets for 3rd grade and 4th grade, five Mystery Detective math case files of sixteen sums a page across four columns. Print and go with full answer keys: no prep math activities for morning work, math centers, early finishers, homework and sub plans. Everyday school stories carry the cases, so this 4 digit addition with regrouping practice works in any month for 3rd grade and 4th grade. Teachers use it for 4th grade math review, a math center or a sub plan, and a CSI Mini Mystery Detective marks itself.

Four digit addition is a long way to carry for a third grader, and a mystery singer in the music room is what holds them, happily, to the last sum. The pages are self-marking throughout, and the whole set is five math pages in a Mystery Detective download.

The Cases

1. Box of Chocolates - a box on the desk, unsigned
2. Missing Pen - a friend's pen has disappeared
3. Mystery Singer - somebody is singing in the music room
4. Acts of Kindness - good deeds and no name
5. Holiday Time - a surprise trip, destination unknown

What's Inside

• Five case files, each a page of 4 digit addition with regrouping
• Sixteen sums per case, set in columns ready to carry
• Four clue lists per page: the who, the where, the when and the what
• A black and white copy of all five cases for everyday printing
• An 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 with one crime on it and four short clue lists beside the sums. Every clue carries a number, the questions produce those numbers, and a matching answer strikes that clue out. After sixteen questions the clues left untouched are the solution. The arithmetic is the only route to it, which is why a careless carry cannot slip past unnoticed.

When to Use This Resource

Use this one when the class has moved past three digits and you want the extra column practiced properly rather than assumed. It is also the right set for the weeks before testing, when multi digit addition is worth a last run. Because everything a student needs is printed on the page, it goes straight into a sub folder or a centers rotation with no explaining.

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

Grade Levels

Written for 3rd grade and 4th grade. Third graders use these at the end of the multi digit addition unit, and fourth graders use them as a fluency set early in the year.

Why Teachers Love These Cases

• One missed carry is caught by the page, not by you
• No preparation of any kind beyond printing
• Five cases makes a full week of warm ups
• Works with a whole class, a small group, partners or one student

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