Box Method Division with Remainders

Inside the case file

Box method division with remainders for your 4th grade class, in ten CSI Mini Mystery Detective math cases with a robot factory theme. Each long division worksheet divides four-digit numbers by one-digit divisors, and every answer is written as a quotient and a remainder. Use them in math centers, for morning work or as homework. They're no prep, with an answer key for each case.

Something has gone wrong at the Robot Factory, and your students are the inspectors sent to find out who did it. Every box method division problem they solve clears one more suspect, and a page of division with remainders turns into a case to crack. When only one name is left standing, students know they've got every answer right, and that last suspect is the villain.

What's Inside

• 10 one-page robot factory cases with 9 problems each, 90 problems in all
• An answer key for every case. The keys show each box filled in, not just the answer
• Four-digit dividends and divisors from 3 to 9
• Every page mixes three kinds of problem: four-digit quotients, a first digit too small to share, and a zero inside the quotient
• A Box Method page that works 2749 ÷ 4 one box at a time and shows how to check the answer
• Teacher instructions, a contents page, a Detective's Case Log and a Chief Inspector certificate
• 30 pages, made to print in black and white

The Cases

1. The Stopped Conveyor Belt - a conveyor belt switched off on the night shift
2. The Stolen Golden Gear - the gear that keeps the giant robot running
3. The Drained Batteries - every battery in the charging room left flat
4. The Missing Wrench - the chief engineer's lucky wrench
5. The Missing Magnet - the magnet that sorts the nuts from the bolts
6. The Hidden Hard Hat - the foreman's hard hat before a safety check
7. The Empty Toolbox - a toolbox on the assembly line emptied out
8. The Unplugged Charger - a robot charger pulled from the wall
9. The Runaway Robot - a new robot that rolled out of the factory gate
10. The Broken Power Drill - a power drill found in two pieces

When to Use This Resource

Use this pack once your class has learned the box method and is ready for remainders. The Box Method page can go on the board while you model the first case, or into a math folder for students who want the steps nearby. All ten cases are at the same level, so you can start anywhere and give different groups different cases. A single case works as a bell ringer, a small group task or part of a sub plan. It's also useful for test prep, intervention and homeschool practice.

Grade Levels

Written for 4th grade, where 4.NBT.B.6 asks students to find quotients and remainders with up to four-digit dividends and one-digit divisors. In 5th grade, the cases work as a review before two-digit divisors.

Why Teachers Love Mystery Detectives

Mystery Detective packs all run the same way, so once students have done one case they can start the next without new directions. You don't have to teach the cases in order. Pick the one you need. Every page ends with a villain to name, and you can check a whole page against the key in a minute or two.

Want more cases like these?

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