4-Digit Addition with Regrouping

Inside the case file

Presidents Day 4 digit addition with regrouping worksheets for 3rd grade and 4th grade, the bigger sister of the 2 digit pack, five math worksheets doubling as Mystery Detective cases with sixteen sums apiece. No prep, print and go, full answer keys, for math centers, morning work, early finishers, homework, test prep and sub plans across February. Lincoln's hat, a missing speech, a costume mix up, a class vote and the election day balloons run through the five cases, and carrying more than once in a sum is where a column quietly vanishes, so every total must match a clue before a suspect comes off the list, which means the CSI Mini Mystery Detective pack catches the lost column on the page and not in your marking pile.

Four digit sums are where a student learns to keep every column in line, and this pack is for the class that has carrying once well in hand. Here the marking is student-led, so it happens on the page rather than at your desk. Presidents Day math in Mystery Detective style, for the class that is past two digits.

The Cases

• President Lincolns Hat - the hat has gone missing
• The Missing Speech - somebody has taken the pages
• President Costume - working out who wore what
• Voting Class President - a count that does not add up
• Missing Balloons - the last case, on election day

What's Inside

• Five color case files, sixteen addition problems on each
• The same five cases again in black and white
• Answer keys for all five cases
• A color-in page for early finishers
• A teacher instruction page - print and go, nothing to prepare
• Four digit addition with regrouping throughout

What Is a CSI Mini Mystery Detective?

One printed page holding one crime and the clue lists that solve it. Each clue carries a number, the sixteen sums on the page produce those numbers, and a correct total knocks a clue out. Work to the last question and a single suspect is left standing. Lose a column and nothing matches, which sends a student back over their working.

When to Use This Resource

Reach for this in the weeks either side of Presidents Day, once four digit addition has been taught and simply needs keeping warm. It works as homework across the holiday week, as a February center, and as a set to leave for a substitute. Use it in math centers, for morning work, with early finishers, for homework, in sub plans and in homeschool lessons, with a whole class, a small group or one student.

Grade Levels

Written for 3rd grade and 4th grade, and useful in 5th grade for students who still need column addition firmed up. Second graders who are confident with three digit sums manage it with support.

Why Teachers Love These Cases

• A wrong total matches no clue, so students catch their own slips
• Color and black and white are both in the download
• A color-in page for whoever finishes first
• Five cases covers the whole Presidents Day week

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