Addition and subtraction within 100, with regrouping on most problems, for 2nd grade. A Halloween CSI Mystery Detective math case that runs as SCOOT task cards around the room, so students solve on the question cards and use each answer to cross a suspect off the sheet until one name is left. That gives you math worksheets and math activities from one no prep download, plus Halloween math for October and detective activities that keep working as math centers, early finishers, homework, morning work, sub plans, test prep and review. Color and black and white versions, with a full answer key. CSI math that gets your class out of their seats.
Getting a class up and moving is the quickest way to buy another twenty minutes of math, and this set is built for exactly that. The cards go up around the room, students take their suspect sheet round and cross a name off at each one, and the mystery is what keeps them moving. Cut the cards once and you have an activity you can run every year.
Ghostly Giggles
Something is laughing in the dark and it is up to the class to find out what. The cards go up around the room, students work their way round, and each answer takes one more suspect off their sheet. Whoever is still standing at the end is the culprit.
What's Inside
- Eleven numbered question cards to put up around the room
- Addition and subtraction within 100, with regrouping on most of the cards
- A suspect sheet for every student to cross names off as they go
- A full color set and a black and white set, so you can print either way
- The answer key, with the culprit named
- Print, cut the cards once, and the activity is ready for any class after that
What Is a CSI Mystery Detective?
A CSI Mystery Detective is a printable investigation your class solves with math. The suspects each carry a number, the questions produce those numbers, and every correct answer takes one suspect out of the running until a single name is left. In the SCOOT version the questions go on the wall and students move between them, which is what makes it a math activity rather than a page of math worksheets. There is nothing to assemble and nothing to buy, and one case fits one class period.
When to Use This Resource
This is the one to reach for when the class has been sitting too long and the addition and subtraction unit still needs covering, which in most rooms is the week of Halloween. Moving between cards keeps the wriggliest students working, and because each answer strikes a name off their own suspect sheet, they are checking themselves the whole way round the room. You get a full period of math out of one print run.
It suits test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, and it works with a whole class, a small group or a single student.
Grade Levels
Written for 2nd grade, where addition and subtraction within 100 sits in the standards. Third graders use it as a fluency warm up at the start of the year, and confident first graders manage it once they are secure with two digit numbers.
Why Teachers Love These Cases
- Students are up and moving, which is half the reason they stay on task
- The suspect sheet tells them when an answer is wrong, so you are not the only checker
- Cut the cards once and the set lasts for years
- Works with a whole class, a small group, partners, or one student alone
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