3-Digit Addition with Regrouping

Inside the case file

3 digit addition with regrouping math activities for 2nd grade and 3rd grade: five math cases, each a Mystery Detective page of column sums. Print and go with full answer keys: no prep math worksheets for morning work, math centers, early finishers, homework and sub plans. Three digit addition with regrouping practice for 2nd grade and 3rd grade, set around school so it fits any week of the year. It runs as a math center, a homework set or a 3rd grade math review, and the CSI Mini Mystery Detective format means students check their own work.

Three digit carrying is where a class learns to write the columns out properly, and five cases with a missing hat make that the fun part. Every page is self-marking, and five math pages make one Mystery Detective download.

Students carry across the tens and hundreds to find each total, then use it to cross off one clue. Each page has four clue lists: who, where, when and what. The stories are about school life, like missing pens and a lost school hat. When students finish with one clue left in every list, they know their carrying was right.

The Cases

1. The Missing Pens - pens gone from the classroom
2. The Mystery Gift - a present with no name on it
3. The Vacation - a student's surprise trip
4. The Missing Hat - a lost school hat
5. Student Prize - good deeds and a prize

What's Inside

• Five color case pages of 3 digit addition with regrouping
• The same five in black and white
• An answer key for each case
• Four clue lists on every page
• Teacher instructions

What Is a CSI Mini Mystery Detective?

It's a printed case on a single page: a crime at the top, addition problems underneath and short clue lists beside them. Every clue has a number. Students cross off clues as their answers match, and the leftovers are the solution.

When to Use This Resource

Use it once 3 digit addition has been taught and students are ready to practice on their own. It's also good to have after a long break, when carrying needs a refresher. The cases suit math centers, small groups, sub days and homeschool.

Grade Levels

Written for 2nd grade and 3rd grade. 3rd graders can use it before 4 digit addition starts.

Why Teachers Love These Cases

• Print and hand out
• Color and black and white
• School stories
• Students can check their own totals

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