3-Digit Subtraction with Regrouping

Inside the case file

3 digit subtraction with regrouping worksheets for 2nd grade and 3rd grade, five Mystery Detective math cases with borrowing across the columns throughout. No prep math activities, print and go with full answer keys, for morning work, math centers, early finishers, homework and sub plans. School stories carry the cases, so this 3 digit subtraction with regrouping practice suits 2nd grade and 3rd grade in any month. Teachers use it as a math center, a homework set or subtraction review, and one CSI Mini Mystery Detective download covers the week.

Borrowing across two columns is the part of the subtraction unit that needs the most practice, and five short cases with a prize and no winner get it practiced with real enthusiasm. Each answer knocks one clue off the list, so every page is self-marking. One CSI Mini Mystery Detective math case a day covers the week.

Every problem needs borrowing, and some need it across two columns. Students solve each one, then cross off the clue with the same number. The cases are set around school, with a lost library book, money found on the ground and a class prize. Students can check their own borrowing as they work.

The Cases

1. The Missing Book - a library book that hasn't come back
2. Money Found - whose money is on the ground
3. Caught Being Good - a student doing good deeds
4. The Missing Ball - finding the owner of a ball
5. The Class Prize - who wins, and what for

What's Inside

• Five color case pages of 3 digit subtraction with regrouping
• The same cases in black and white
• An answer key for each case
• Problems set out in columns
• Teacher instructions

What Is a CSI Mini Mystery Detective?

It's one page with a short crime story, a set of subtraction problems and clue lists for who, where and when. Each clue carries a number. Matching answers cross clues off, and the ones left over solve the case.

When to Use This Resource

Use this pack once borrowing has been taught and your class needs practice on their own. It works again as review before a test, or for 3rd graders who need a refresher before 4 digit subtraction. You can hand out one case at a time. They're handy as homework, for early finishers and in homeschool.

Grade Levels

Written for 2nd grade and 3rd grade. 2nd graders meet borrowing here, and 3rd graders use it for review.

Why Teachers Love These Cases

• Print and go
• Both color and black and white
• Students see right away if an answer doesn't match
• School stories kids know

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