2-Digit Subtraction with Regrouping

Inside the case file

2 digit subtraction with regrouping worksheets for 2nd grade and 3rd grade: five Mystery Detective math cases, borrowing from the tens on every page. Print and go with full answer keys: no prep math activities for math centers, early finishers, morning work, homework and sub plans. Subtraction with regrouping is the skill 2nd grade and 3rd grade students need the most practice at, and these school mysteries give it to them without a plain worksheet in sight. Use the pack for math centers, morning work or early finishers, and a CSI Mini Mystery Detective marks itself.

Borrowing is the point in the subtraction unit where repetition pays off most, and a student in trouble whose name nobody knows is what gets five pages of it done with a smile. Students cross a suspect off with every answer, checking their own borrowing as they go, and the pages mark themselves. One CSI Mini Mystery Detective math case fits a morning work slot.

One case follows a student picking up trash around the playground, and another is about an apple missing from a lunch box. Students subtract, then cross off the clue that matches. When they borrow correctly, the clue lists narrow down to a single answer.

The Cases

1. The Missing Apple - an apple taken from a lunch box
2. Caught Being Good - who has been doing good deeds
3. Finding Trash - a student cleaning up the playground
4. In Trouble - which student got in trouble
5. The Surprise Present - an unsigned gift for the teacher

What's Inside

• Five cases of 2 digit subtraction with regrouping
• A borrow in every problem
• Black and white copies of all five
• An answer key for every case
• Teacher instructions

What Is a CSI Mini Mystery Detective?

A CSI Mini Mystery Detective is a single page: a crime, a set of problems and short clue lists beside them. Each clue has a number. Students cross off any clue their answer matches, and what's left tells them who did it.

When to Use This Resource

Use this pack after borrowing from the tens has been taught. It's also a good refresher for 3rd graders before 3 digit subtraction. The cases work as homework, with small groups, on sub days and in homeschool.

Grade Levels

Written for 2nd grade and 3rd grade. 2nd graders meet borrowing from the tens here.

Why Teachers Love These Cases

• Borrowing practice on every page
• School stories
• Nothing to prepare
• Students know right away if an answer is off

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