2-Digit by 1-Digit Multiplication

Inside the case file

2 digit by 1 digit multiplication review worksheets for 3rd grade and 4th grade, five math worksheets with the Mystery Detective lineup on every page and twenty problems each. Print and go, no prep, full answer keys and a black and white set, for math centers, morning work, early finishers, homework, sub plans and math review any week of the year. The cases are everyday school stories, so this works in any month, and it gives 3rd grade and 4th grade students the 2 digit by 1 digit multiplication practice they need once the times tables are known. Teachers use it for multiplication review before a test or as a math center that runs on its own, one CSI Mini Mystery Detective case a day.

This is the step where students meet carrying inside multiplication for the first time, and plenty of repetitions is what makes it stick. The case gives them a reason to enjoy twenty, and the lineup makes every page self-marking. It is the sister pack to the times tables 2 by 1 set, with different cases and the same Mystery Detective math.

This is often the first time students carry in multiplication, and each case gives them a full page of problems to practice it. The answers match numbers in the clue lists, and students cross each one off as they find it. A missed carry leads to a number that isn't there, which tells them to look again.

The Cases

1. The Missing Bike - a bike stolen from a friend
2. Teacher Appreciation Mystery Gift - a gift with no name on it
3. The Vacation - which student is going where
4. The Teachers Lunch - the teacher's missing lunch
5. Student Prize - a student doing good deeds

What's Inside

• Five case pages in color
• All five cases in black and white
• Answer keys
• 2 digit by 1 digit multiplication throughout
• A teacher instruction page

What Is a CSI Mini Mystery Detective?

Problems go on the left of the page, and on the right are lists of names, places and times, each with a number. Students cross off whatever matches their answers. What's left at the end solves the case.

When to Use This Resource

These fit after the standard algorithm has been introduced, when students are ready to practice it on their own. They make good review before a test as well. Use them for morning work, give them to small groups, or keep them for a sub day.

Grade Levels

Written for 3rd grade, 4th grade and 5th grade. They also give 6th graders extra practice if they need it.

Why Teachers Love These Cases

• Nothing to prep
• Color or black and white, whichever you prefer
• Students check their own carrying
• Five cases in one download

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