4-Digit Addition with Regrouping

Inside the case file

Five Easter cases of 4 digit addition with regrouping for 3rd grade and 4th grade, sixteen sums a page and every one carrying through the thousands. Each correct total crosses a suspect off the lineup and a wrong one crosses off nobody, which makes these math worksheets and Mystery Detective cases self-checking without any marking from you. Print and go with full answer keys: Easter math activities for March and April, then math centers, early finishers, homework, morning work and sub plans for the rest of the year.

Four digit addition is the biggest carrying a third grader meets, and an unsigned Easter basket on the teacher's desk is what gets sixteen sums a page done without a fight. Because each total has to land on a name, a missed carry shows up on the lineup before it shows up in your marking. Keep one CSI Mini Mystery Detective math case back for the review week.

The Cases

• The Missing Easter Egg - an egg has been stolen and nobody saw who
• Easter Egg Basket - a basket turns up on the teacher's desk, unsigned
• Missing Easter Egg Basket - the Easter Bunny's own basket has gone
• The Easter Bunny Carrot - somebody has half eaten the carrot
• Easter Eggs For Everyone - an egg on every desk and no name on any of them

What's Inside

• Five case files, each a page of 4 digit addition with its own lineup of suspects
• Regrouping through the tens, hundreds and thousands on every page
• Each total matches one suspect only, so the page checks itself
• Five Easter stories, so the theme carries the week
• 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 one page printable investigation your class solves with math. It runs like a math escape room with no locks and no app: each correct answer rules one suspect out of the lineup until a single name is left. One case fits one class period, which suits math centers or a sub plan just as well as a lesson.

When to Use This Resource

March and April is where most teachers reach for these, in the week before the Easter break when a plain worksheet will not hold the room. They also keep multi digit carrying sharp long after the unit has moved on.

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 student.

Grade Levels

Written for 3rd grade and 4th grade. Third graders use it once carrying through hundreds is secure and fourth graders treat it as fluency practice before the standard algorithm is tested.

Why Teachers Love These Cases

• Students spot their own mistakes when the wrong suspect is crossed off
• Zero prep in the week nobody has time to prepare
• One case a day covers a full week of morning work
• Works with a whole class, a small group, partners or one student

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