2-Digit Addition with Regrouping

Inside the case file

Presidents Day 2 digit addition with regrouping worksheets for 2nd grade and 3rd grade, five February math cases with Mystery Detective rules and sixteen sums a page. No prep, print and go, full answer keys: math centers, morning work, early finishers, homework and sub plans for the short week around the holiday. Lincoln's hat goes missing, a speech loses its pages and a class election count refuses to add up, students add down the page and every correct total crosses off a suspect, so a carrying slip matches no clue and gets fixed on the spot, five CSI Mini Mystery Detective cases that also give the wall something to show in February.

February is a short month with a holiday in the middle, and two digit addition is exactly the skill worth polishing after a long weekend. These cases make the revision feel like a game, and the presidents give you something to pin up in a month that usually has nothing. Five pages of Presidents Day math, one Mystery Detective to name before the balloons go missing.

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
• Two 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 has a number beside it, 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. Forget to carry and nothing matches, so a student goes back over their own work.

When to Use This Resource

This is built for the weeks either side of Presidents Day, when two digit addition has been taught and needs keeping sharp rather than introducing. It works as homework across the holiday week, as a February center, and as something 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 on their own.

Grade Levels

Written for 2nd grade and 3rd grade, and useful in 4th grade for students who still lose the carry. A confident first grader can work through the earlier cases with support.

Why Teachers Love These Cases

• A wrong total matches no clue, so students mark themselves
• 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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