Adding Fractions (Unlike Denominators)

Inside the case file

Adding fractions with unlike denominators worksheets for 4th grade, 5th grade and 6th grade, in five CSI Mini Mystery Detective cases with math students check as they go. They're no prep and suit homework, math centers or small groups. Color and black and white copies come with answer keys.

Students find a common denominator, rewrite both fractions and add. Answers don't need to be simplified. Each answer matches a clue to cross off, and the stories include a stolen phone and a student who's been misbehaving.

The Cases

1. Kidnapped - a classmate nobody can find
2. Certificate - who earned the certificate
3. The Present - who the present is for
4. The Phone - a neighbor's stolen phone
5. Being Naughty - a student who misbehaved

What's Inside

• Five color case pages of fraction addition
• Black and white copies
• Answer keys
• A coloring page
• A teacher instruction page

What Is a CSI Mini Mystery Detective?

It's a one-page case with a crime story, fraction problems and clue lists. Every clue has a value. Students cross off the clues their answers match, and the leftovers give the answer.

When to Use This Resource

These come after adding fractions with like denominators. Use them while your class learns to find common denominators, or as review before a test. They also work as bell ringers, for early finishers and in homeschool.

Grade Levels

Written for 4th grade, 5th grade and 6th grade, with 6th graders using it for review.

Why Teachers Love These Cases

• Common denominators on every page
• Color and black and white
• Answers that don't need simplifying
• No prep

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