4-Digit Addition with Regrouping

Inside the case file

New Year math worksheets for 2nd grade, 3rd grade and 4th grade: five January cases of 4 digit addition with regrouping, each a CSI Mini Mystery Detective math page. Print and go, full answer keys: no prep math centers, morning work, early finishers, homework and sub plans for the first weeks back. A party popper nobody saw, a secret gift and a countdown heard in an empty room carry the theme, each total crosses a suspect off the lineup until the culprit is left, and carrying across four columns is what gets students there.

The first week of January needs something with a bit of pull, and a New Year party with an invitation for the detective has more pull than a page of sums. Students add, find the suspect with that total and cross the name off, so the class settles into the year without you at the front. All five CSI Mini Mystery Detective math pages are self-marking.

The Cases

1. Party Popper - a party popper goes off unseen
2. New Year Gift - a secret gift on the desk
3. Auld Lang Syne - someone singing where nobody was looking
4. New Year Countdown - a countdown heard with nobody there
5. New Year Party - an invitation left for the detective

What's Inside

• Five case sheets in color, each with its own lineup of suspects
• The same five cases in black and white for cheaper printing
• 4 digit addition with regrouping, 16 questions on every sheet
• Every answer matches one suspect and no other, so the page checks itself
• A full answer key for all five cases
• A teacher instruction page and a color in page for early finishers

What Is a CSI Mini Mystery Detective?

A CSI Mini Mystery Detective is a printed case with a lineup of suspects, each carrying a number. The questions on the crime sheet produce those numbers, a correct answer strikes one suspect off, and the last name standing is the culprit. The elimination only works when the math is right, which is what makes these detective activities catch slips that a page of math worksheets would let through. One case fits one class period, with nothing to prepare.

When to Use This Resource

Bring this out in the first week back in January, when the class needs something to settle into and the addition unit picks up where it left off. Four digit addition with regrouping is a skill that wants repetition, and five separate cases give you that without five identical pages. Because a wrong total takes the wrong name off the lineup, students find their own slips before you ever see the sheet.

It covers test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, with a whole class, a small group or one student on their own.

Grade Levels

Written for 2nd grade, 3rd grade and 4th grade, where multi digit addition with regrouping sits in the standards. Fifth graders take it as a quick refresher before larger numbers, and it works as an extension for a confident 1st grader.

Why Teachers Love These Cases

• Four digit totals, big enough to need regrouping on nearly every question
• Students check themselves, because the wrong total takes off the wrong name
• Print and go, and the answer keys make grading quick
• Color and black and white versions of every case

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