Place Value & Skip Counting CSI Mystery Worksheets

Inside the case file

2nd grade, 3rd grade and 4th grade place value, skip counting and number sequences CSI math worksheets, built into a CSI Mystery Detective case where the Place Value Bandit has scrambled the school playground. The seesaw lifts the heavy end, the hopscotch numbers run in an order nobody recognizes, and the only description of the culprit is the numbers left behind. It doubles as a 3rd grade math or 4th grade math review and suits a March timetable when practice needs a lift. Students finish sequences, skip count through four-digit numbers, compare numbers on the seesaw, and decode letters through a key, crossing off suspects until the mystery is solved. Answer keys included.

The Case: The Place Value Bandit in the Playground

The playground has stopped working properly. The seesaw lifts the heaviest person and drops the lightest, the hopscotch numbers run in an order nobody recognizes, and the whole yard has quietly stopped making sense. The Place Value Bandit has been through, and the numbers left behind are the only description of them anyone is going to get.

What's Inside

• Number sequences completed to reveal the letter that matters
• Skip counting patterns running through three-digit and four-digit numbers
• Comparing two numbers on a seesaw to decide which is greater
• Checking worked answers for errors and tallying which are correct
• A key used to decode letters into the next piece of the description
• Full color and black-and-white versions of every page
• Answer keys for the whole case

What Is a CSI Mystery Detective Case?

The shape of it is always the same: a crime, a line-up of suspects, and math that decides which of them it cannot be. That is a CSI Mystery Detective case - a math escape room that needs a printer rather than locks, an app or any prep. It beats math worksheets on the same content for one reason: a wrong answer breaks the deduction loudly, so students go back over their own work. It fills a whole lesson, sits in math centers, or works as detective activities for early finishers.

When to Use This Resource

• Place value and skip counting review before or after a unit
• Back-to-school weeks and end of year review
• Math centers, early finishers and independent work
• Emergency sub plans that run themselves
• Whole-class detective sessions, small groups or partner work

Grade Levels

Built for 2nd grade, 3rd grade and 4th grade. Second graders usually pair up for the four-digit sequences; third and fourth graders run it independently. It also suits 5th grade students who need a place value refresher without it feeling like going back a year.

Why Teachers Love CSI Mystery Detective Cases

• Zero prep - print and hand out
• Self-checking by design, because a wrong answer breaks the deduction
• Counting and place value practice with a point to it
• Works as a whole lesson, a center, or a filler for an awkward afternoon

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