2-Digit by 2-Digit Multiplication

Inside the case file

2 digit by 2 digit multiplication worksheets for 4th grade and 5th grade, five winter CSI Mini Mystery Detective math cases where the product points at a suspect and the wrong product points at nobody. A snowball fight, a missing raincoat and a snowman nobody admits to building carry the theme, and the multi digit multiplication underneath is the practice a class needs in the weeks after the holidays. Snow day math activities for December, January and February, then no prep math centers, early finishers, homework and sub plans, full answer keys.

Long multiplication is the topic students stop halfway through, and a winter culprit is the reason they get to the last question. Because every product has to land on a name, a slipped carry shows up on the lineup and they check it themselves. Keep one CSI Mini Mystery Detective math case back for the snow day nobody planned for, when a lesson has to run itself.

The Cases

1. Snowball Fight - who threw the first one
2. Missing Raincoat - gone on the wettest day of the year
3. Hot Chocolate - a hot chocolate left on the desk
4. Snowman Mystery - a snowman nobody admits to building
5. Present for Teacher - a parcel nobody will open

What's Inside

• Five case files, each with a crime sheet and its own lineup of suspects
• 2 digit by 2 digit multiplication on every page
• Room on the sheet for students to set the partial products out properly
• 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 page, one crime and one class period. Every suspect in the lineup is tagged with a number, the questions produce those numbers, and a correct answer knocks a suspect out until the last one standing is the culprit. Nothing needs cutting, laminating or charging, which is why these detective activities get used on the days ordinary math worksheets would be handed out. It works as a lesson, in math centers, or left for a substitute.

When to Use This Resource

December through February is the natural run, and a snow day or the week either side of a break is where this set gets used most. Two digit by two digit is the point where students stop lining the second row up properly, and that one habit costs them the whole answer. A misplaced row crosses off the wrong suspect here, so they see it and fix the layout rather than the numbers.

It suits test prep, homework, math centers, morning work, early finishers, sub plans and homeschool lessons, with a class, a small group or one student alone.

Grade Levels

Written for 4th grade and 5th grade, where 2 digit by 2 digit multiplication sits in the standards. Third graders take it once they are fluent with facts to twelve, and 6th graders use it as a warm up before multiplying decimals.

Why Teachers Love These Cases

• Catches the missing zero on the second row, which is the classic slip
• Students correct themselves when the wrong suspect is crossed off
• No prep on the day the bus is late and half the class is missing
• Works with a whole class, a small group, partners, or one student alone

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