2-Digit Subtraction with Regrouping

Inside the case file

Valentines Day 2 digit subtraction with regrouping math worksheets for 1st grade and 2nd grade: five short math cases, each a Mystery Detective page. No prep, print and go, full answer keys, for math centers, morning work, early finishers, homework and sub plans in February. Chocolates with no name, a card with no signature and flowers left overnight carry the cases, each answer crosses a suspect off the lineup until the culprit is left, and the borrowing underneath is the practice a young class needs, on a CSI Mini Mystery Detective page they will finish.

February is when this gets used, but the subtraction is the point and the cards and chocolates are only the setting, so it is still useful in April. Each answer a child works out rules a suspect out, so the page is self-marking, and one CSI Mini Mystery Detective math case fits a morning work slot.

The Cases

1. Chocolates for Teacher - chocolates and no name attached
2. Valentines Day Card - a card with no signature
3. Love Songs - somebody is singing love songs
4. Bunch of Flowers - left on the teacher's desk overnight
5. Acts of Kindness - good deeds with nobody taking credit

What's Inside

• Five case files, each with a crime sheet and its own lineup of suspects
• Two digit subtraction with regrouping on every page
• Borrowing needed on most problems, so it is not a mixed set
• Each answer matches one suspect and no other, so the page checks itself
• A full answer key for every case
• Print and go: no cutting, no laminating, nothing to prepare

What Is a CSI Mini Mystery Detective?

A CSI Mini Mystery Detective is one printed page carrying one crime and one lineup. Each suspect has a number, the crime sheet produces those numbers, and a correct answer removes that suspect until a single name is left. Nothing is laminated, charged or bought, so the math does the whole job, and that is the difference between these detective activities and a page of math worksheets. A case runs about a class period.

When to Use This Resource

Use these in the run up to Valentines Day, when borrowing has been taught and needs repetitions but nobody is in the mood for another page of sums. Five short cases spread across the week, so you are not handing out the same sheet twice. A child who takes the smaller digit from the larger one crosses off the wrong suspect and sees the problem for themselves.

It covers test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, with a class, a small group or one child alone.

Grade Levels

Written for 1st grade and 2nd grade, where two digit subtraction with regrouping sits in the standards. Third graders take it as a February refresher, and first graders manage it once subtracting without borrowing is secure.

Why Teachers Love These Cases

• Borrowing on nearly every problem, not one or two per page
• Students catch the classic subtraction habit themselves
• No prep in the week of Valentines Day
• Works with a whole class, a small group, partners, or one student alone

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