3-Digit Subtraction with Regrouping

Inside the case file

Christmas 3 digit subtraction with regrouping worksheets for 2nd grade and 3rd grade: five printable math activities, Mystery Detective style, borrowing across the columns on every page. No prep, print and go, full answer keys, for morning work, math centers, early finishers, homework and sub plans through December. December is a good month for subtraction with regrouping practice, and this pack gives 2nd grade and 3rd grade students a week of it inside a school Christmas story. It works as Christmas math activities for math centers, morning work or the class party week, and a CSI Mini Mystery Detective marks itself.

Borrowing fits the week of the class party perfectly when there is a reason to care, and an unsigned box of chocolates on the desk is that reason. The pages mark themselves as students cross the suspects off. It is math practice and a Mystery Detective case in one.

The Cases

1. Class Secret Santa - a gift with no label
2. Christmas Chocolates - chocolates on the desk, unsigned
3. Christmas Carols - singing from the music room
4. Christmas Presents - who unwraps theirs first
5. Christmas Good Deeds - kindness and nobody owning up

What's Inside

• Five Christmas cases, each a page of 3 digit subtraction with regrouping
• Sixteen questions per case, laid out in columns ready to borrow
• Clue lists down the side of every page, so one answer removes one clue
• A black and white copy of all five cases for everyday printing
• An answer key for every case
• Print and go: no cutting, no laminating, nothing to set up

What Is a CSI Mini Mystery Detective?

A CSI Mini Mystery Detective is one page carrying a crime, a short list of clues and the questions that eliminate them. Every clue has a number, the subtraction produces those numbers, and a correct answer crosses that clue off until only the solution is left. Nothing is cut, laminated or charged. The borrowing has to be right for the elimination to work, which is what makes a mistake show.

When to Use This Resource

Keep this one for the fortnight before the break, when the timetable is broken up by rehearsals and parties and a lesson has to run on its own. It is also the set to use straight after the holidays, because borrowing across columns is the first thing a class forgets. Every instruction is printed on the sheet, so a relief teacher can hand it out with no briefing.

Use it for morning work, math centers, early finishers, homework, class parties, sub plans and homeschool lessons, with a whole class, a small group or one student.

Grade Levels

Written for 2nd grade and 3rd grade. Second graders meet borrowing across columns here, and third graders use the cases as a December refresher before four digit subtraction.

Why Teachers Love These Cases

• Students keep going in the week nothing else holds them
• Print and hand out, with no preparation at all
• Five cases carries the whole fortnight before the break
• Suits a whole class, a small group, partners or one student

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