2-Digit by 1-Digit Multiplication

Inside the case file

Christmas math worksheets for 3rd grade and 4th grade: five Mystery Detective math cases of 2 digit by 1 digit multiplication, where each product crosses a classmate, a person or a place off the clue list beside the sums. Missing decorations, a cookie somebody got to first and a candy cane left for the teacher carry December, and the multiplication underneath is the fluency check a class needs before the break. Print and go with full answer keys, no prep: December math centers, morning work, early finishers, homework and sub plans from one CSI Mini Mystery Detective math download.

Somebody has eaten the Christmas cookie and nobody is owning up, which is enough to get a third grade class through a page of multiplication in the week they are least inclined to do it. A wrong product matches no clue, so students check their work before they cross anything off, and the answer keys make five pages a quick mark. Five math cases, one Mystery Detective file.

The Cases

1. Missing Xmas Decorations - a teacher cannot find them
2. Who Ate The Xmas Cookie - a classmate got there first
3. Secret Santa - a gift and no name
4. Candy Cane - somebody left one for the teacher
5. Christmas Turkey - who is carving it this year

What's Inside

• Five Christmas cases, each a page of 2 digit by 1 digit multiplication
• A clue list down the side of each page, so one product removes one name
• A red-ink answer key for all five cases
• Five separate Christmas stories, so the theme carries the fortnight
• Sized for one class period a case
• Print and go: no cutting, no laminating, nothing to prepare

What Is a CSI Mini Mystery Detective?

A CSI Mini Mystery Detective is a single printed page with a crime at the top and a short clue list beside the questions. Every clue carries a number, the questions produce those numbers, and a match strikes that clue out. The clue nobody matched is the answer. Nothing is cut, laminated or charged, so the arithmetic does the whole job.

When to Use This Resource

December is the month a lesson has to hold a class on its own, and these five cases were built for exactly that fortnight. They also suit the day of a class party and the afternoon after a Christmas assembly, when the timetable has already gone. Because the whole task is printed on the page, they make a safe sub folder resource in the busiest weeks of the year.

Use it for morning work, math centers, early finishers, homework, class parties, sub plans and homeschool lessons, with a whole class, a small group or one student.

Grade Levels

Written for 3rd grade and 4th grade. Third graders use these once the times tables are secure, and fourth graders use them as a December warm up before two digit by two digit work.

Why Teachers Love These Cases

• Holds a class in the last fortnight of term, which is the hard part
• No preparation in the month that has none to spare
• Five cases covers the whole run up to the break
• Works with a whole class, a small group, partners or one student

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