3-Digit Addition & Subtraction

Inside the case file

Thanksgiving 3 digit addition and subtraction math activities for 2nd grade and 3rd grade: five math activities in the Mystery Detective format, with carrying and borrowing on the same page. Print and go with full answer keys, no prep, for morning work, math centers, early finishers, homework and sub plans in the week before the break. Thanksgiving math with regrouping for 2nd grade and 3rd grade, carrying and borrowing on the same page, all set around a school Thanksgiving. It suits November math centers, morning work and the days before the break, and it prints and goes as five CSI Mini Mystery Detective cases.

Somebody has to carve the turkey and nobody will say who, which is enough to get a second grade class through a page of three digit regrouping in the week they are most excited about everything else. Each answer takes a clue off the list, so the pages are self-marking. One CSI Mini Mystery Detective math case a day covers the short week.

The first case asks who's going to carve the turkey, and the others follow a thank you gift, a surprise lunch for the teachers and a family trip. Students add and subtract with regrouping, then cross off the clue that matches each answer. When the work is right, one answer is left in each list.

The Cases

1. Who is Carving the Turkey - the family feast needs a carver
2. Thankful Teacher - a student the teacher wants to thank
3. Thank You Gift - an unsigned gift on the desk
4. Surprise Lunch - lunch made for the teachers
5. Vacation Time - a student's family Thanksgiving trip

What's Inside

• Five Thanksgiving cases in color
• Black and white copies of all five
• An answer key for each case
• 3 digit addition and subtraction with regrouping
• Teacher instructions

What Is a CSI Mini Mystery Detective?

A CSI Mini Mystery Detective is a one-page case. Students read the story, solve the problems and use each answer to cross off a clue. The clues that are still there at the end tell them what happened.

When to Use This Resource

This is for the weeks leading up to Thanksgiving. The math is plain 3 digit regrouping, though, so it also works as mixed addition and subtraction review at other times. Use a case as a bell ringer, with a small group, on a sub day or for homeschool.

Grade Levels

Written for 2nd grade and 3rd grade, as practice at the end of the 3 digit unit or as review.

Why Teachers Love These Cases

• A Thanksgiving theme on every case
• Addition and subtraction in one pack
• No prep
• Color and black and white

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