Adding and Subtracting Mixed Numbers

Inside the case file

Adding and subtracting mixed numbers with like denominators is the skill on every page of these 4th grade CSI Mini Mystery Detective math worksheets. There are ten no prep cases with a carnival theme, and they're print and go math activities for practice adding and subtracting fractions with like denominators. Use them for math centers, morning work, homework or sub plans. Every case has an answer key.

Use this pack once your class can add and subtract fractions with like denominators. Students match each answer to a suspect's ID badge and cross that name off, and the last suspect left is the culprit. The fractions are printed stacked, the way students write them. The pages are self-checking.

What's Inside

• Ten one-page carnival detective cases on adding and subtracting mixed numbers, each with an answer key
• Adding mixed numbers, subtracting mixed numbers, and pages that mix both
• Adding where the fractions make more than one whole, from thirds up to twelfths
• Subtracting with regrouping, including whole numbers minus mixed numbers, such as 6 - 2 3/8
• Two mixed review cases, including some answers less than one whole
• A reference page with a worked example of every step
• 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 Stolen Lollipops - adding mixed numbers
2. The Melting Ice Cream - subtracting mixed numbers
3. The Midnight Ferris Wheel - adding and subtracting on one page
4. The Seal Show Switch - carrying a whole in thirds to fifths
5. The Runaway Unicycle - carrying wholes up to twelfths
6. The Empty Ticket Box - subtracting with regrouping
7. The Early Fireworks - whole numbers minus mixed numbers
8. The Masked Stranger - every kind of problem, signs mixed
9. The Clown's Missing Nose - mixed review
10. The Ringmaster's Last Trick - mixed review with some answers less than one whole

When to Use This Resource

The cases start with adding, then subtracting, then carrying a whole, then regrouping. You can hand out one at a time through the fractions unit, or pull the single page a group needs, such as the regrouping case for students still working on borrowing. The two review cases at the end make a check before a fractions test. It also works for guided math groups, test prep, early finishers, homeschool lessons, and back to school or end of year fraction review.

Grade Levels

Written for 4th grade, where students first add and subtract mixed numbers with like denominators. The bigger numbers in the final cases give confident 4th graders a stretch, and the pack makes a quick fraction review at the start of 5th grade before unlike denominators arrive.

Why Teachers Love Mystery Detectives

• No prep. Print the cases you need.
• Every correct answer crosses off a suspect
• Cases build step by step. Different students can work on different pages.
• A carnival mystery across all ten cases
• Prints clean in black and white

Want more cases like these?

Follow Kiwiland Education to discover more CSI Mini Mystery Detective cases, no-prep math activities, and detective-themed printables for elementary classrooms.

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