Missing Factor Multiplication & Division

Inside the case file

Missing factor multiplication and division worksheets for 3rd grade, with every kind of unknown number equation in one no prep CSI Mini Mystery Detective math pack with a space theme. The ten printable cases cover missing factors, missing divisors and missing dividends. Use it as a math center, for morning work or homework, or as an early finisher challenge. Each case comes with its answer key.

Use this pack once your class knows its times tables and you want to practice the related division facts. Students find the missing factor, divisor, quotient, dividend or product, with the ? on either side of the equals sign. Each page uses a different set of factors, and every table from 2 to 10 comes up across the ten cases. Students match each answer to a suspect's badge and cross the name off. The pages are self-checking.

What's Inside

• Ten one-page detective cases with 20 missing number equations each, and an answer key for every case
• Missing factors, missing divisors, quotients, missing dividends and products, all within 10 x 10
• Equations written both ways, like 6 x ? = 42 and 42 = 6 x ?
• A reference page with a worked example for each type of equation and a fact family
• A contents page, teacher instructions, a detective case log and a certificate of achievement
• 30 black and white pages, ready to print

The Cases

1. The Missing Moon Rock
2. The Scrambled Star Map
3. The Frozen Airlock
4. The Rover Joyride
5. The Telescope Trick
6. The Silent Radio Dish
7. The Dark Solar Panels
8. The Empty Escape Pod
9. The Fake Alien Visit
10. The Floating Boots

When to Use This Resource

These cases fit best once your class has met multiplication and division and you are ready to tie the two together. Every page mixes all five types of equation, so students have to read each one carefully and think about which fact family it belongs to, rather than working down a column of the same sum. The cases stand on their own. You can hand out one at a time, save a few for review before a unit test, or give the whole set to a strong group to work through at their own pace. It also works for guided math groups, bell ringers, test prep, sub days, homeschool and back to school review in 4th grade.

Grade Levels

Written for 3rd grade, where finding the unknown number in a multiplication or division equation is taught, with every fact inside 10 x 10. It also works as a beginning of the year multiplication and division review for 4th grade.

Why Teachers Love Mystery Detectives

• Print and use
• Self-checking with a suspect line-up
• Missing factors, missing dividends and products together in one multiplication and division pack
• A space station story with moon rovers, star maps and a fake alien visit
• Easy black and white printing

Want more cases like these?

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