Percentage of a Number
Mystery Detective Worksheets · Grades 6–7 · Printable Detective Pack
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Inside the case file
Percentage of a number for 6th grade and 7th grade, finding percentages of a given amount. Students work each one on the crime sheet, then cross a suspect off the lineup until one name is left, so calculating percentages arrives as math worksheets and math activities in one no prep download. Five CSI Mini Mystery Detective math case files for the percentages unit, then test prep, math centers, early finishers, homework, morning work, sub plans and spiral review, any month of the year. No prep CSI math, with detective activities and full answer keys.
Students will work through far more percentages when there is a culprit at the end of them. Every answer here takes one suspect off the lineup, so the class keeps going and spots its own slips before the page ever reaches you. One case suits a period, so the five of them cover a week of homework or a run of math centers.
The Cases
- The Missing Phone - it disappeared between classes
- The Missing Teacher - a teacher has disappeared
- The Principals Car - the principal's car is stolen
- The Bank Job - someone emptied the vault
- Diamond Heist - a chest of diamonds is gone
What's Inside
- Five case files, each with a crime sheet and its own lineup of suspects
- Finding a percentage of a given amount on every page
- Percentages that include the awkward ones, not just 10, 25 and 50
- 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 hands your class a crime and a lineup, and the way through it is the math. Work the questions, match each answer to the suspect wearing that number, strike the name off, and keep going until one suspect has not been ruled out. There is no kit and nothing to assemble, and because the elimination depends on the arithmetic, these detective activities do what math worksheets cannot: students catch their own mistakes. One case fills a class period.
When to Use This Resource
Bring this out once your class can find ten percent and is ready to work out the rest from it, which is the moment percentages either click or fall apart. It is also a solid review in the week before the test, because the five cases spread across the full range rather than drilling the easy ones. A percentage taken of the wrong number crosses off the wrong suspect, so students catch it themselves.
It covers test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, with a whole class, a small group or one student alone.
Grade Levels
Written for 6th grade and 7th grade, where finding a percentage of a quantity sits in the standards. Fifth graders take it once they are secure with fractions and decimals, and 8th graders use it as a refresher before percent increase and decrease.
Why Teachers Love These Cases
- Goes past the easy percentages, which is where real practice starts
- Students find their own errors when 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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