4-Digit Subtraction with Regrouping

Inside the case file

4 digit subtraction with regrouping math activities for 3rd grade and 4th grade: five math cases in the Mystery Detective format, borrowing across four columns on every page. Print and go with full answer keys: no prep math worksheets for morning work, math centers, early finishers, homework and sub plans. Four digit subtraction with regrouping for 3rd grade and 4th grade, set around school so it fits any month, and the borrowing practice a class needs before moving on. It suits math centers, homework and 4th grade math review, and a CSI Mini Mystery Detective marks itself.

Borrowing across four columns is the skill that carries the whole multi digit unit, and a prize with no winner named is what gets the practice done with a smile. The lineup does the checking, so the marking is student-led. One CSI Mini Mystery Detective math case a day covers the week.

Some problems need a borrow in one place and others need it in two or three. Students work each one, then cross off the matching clue in four lists: who, where, when and what. The stories include fruit missing from a lunch box and a library book that never came back.

The Cases

1. Mystery Present - a gift with no name on it
2. Acts of Kindness - good deeds around the school
3. The Missing Fruit - fruit gone from a lunch box
4. Student Prize - who won the prize
5. The Missing Book - a library book not returned

What's Inside

• Five cases of 4 digit subtraction with regrouping
• Four clue lists on each page
• Black and white copies of every case
• Answer keys
• A teacher instruction page

What Is a CSI Mini Mystery Detective?

Students read a short crime story, solve the subtraction and cross off clues that match their answers. Each clue has a number beside it. By the end, one clue is left in every list, and that's the solution.

When to Use This Resource

These work after 4 digit subtraction has been taught, and as a start-of-year check in 4th grade. Try them in a math center, with a small group, on a sub day or in homeschool.

Grade Levels

For 3rd grade and 4th grade classes.

Why Teachers Love These Cases

• Borrowing across four places
• Print and go
• Students catch their own mistakes
• School stories

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