Three CSI Mini Mystery Detective math case files for 1st grade and 2nd grade, on 10 more 10 less and 1 more 1 less. Students work the number sense problems on each crime sheet, then use the answers to cross a suspect off the lineup until one name is left, which turns number relationships into math worksheets and math activities your class will finish. Back to school math for August and September, with a school theme running through all three cases, then math centers, early finishers, homework, morning work, sub plans and test prep for the rest of the year. Print and go CSI math, with full answer keys and detective activities your class can run on their own.
First graders will work through ten more and ten less all morning when there is someone to catch at the end of it. Each answer your class works out takes a suspect off the lineup, so a six year old keeps going because they want to know who did it. Short pages, so one case fits a morning work slot, and the answer keys are behind every one.
The Cases
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The Half-Eaten Apple - half the teacher's apple is gone
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The Missing Principal - the principal is nowhere to be found
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The School Supplies - the whole classroom stash is gone
What's Inside
- Three case files, each with a crime sheet and its own lineup of suspects
- 1 more, 1 less, 10 more and 10 less on every page
- Numbers stay inside 120, so the counting is the work and not the reading
- 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 holding one crime. The suspects stand in a lineup with a number each, the questions on the crime sheet produce those numbers, and a correct answer knocks a suspect out until the last one left is the culprit. Nothing is cut out or laminated, so what does the work is the arithmetic itself, and that is the difference between these detective activities and a page of math worksheets. One case runs for a class period.
When to Use This Resource
Slot this into the number sense unit, right after your class has met adding and taking ten on a hundred chart and needs to do it without one. It is also the page to hand out later in the year when the skill has quietly gone, which with 10 more and 10 less it always does. Because a wrong answer strikes off the wrong suspect, young students notice the mistake themselves.
Teachers use it for test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, with a whole class, a small group or one child alone.
Grade Levels
Written for 1st grade and 2nd grade, where 1 more, 1 less, 10 more and 10 less sit in the standards. Kindergarten classes take the 1 more and 1 less case at the end of the year, and third graders use the set as a fast warm up before 100 more and 100 less.
Why Teachers Love These Cases
- Small numbers and short pages, which suits a first grade attention span
- Students see their own mistakes as the wrong suspect comes off the lineup
- No prep, and the answer keys make grading quick
- Works with a whole class, a small group, partners, or one student alone
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