Why ‘Which One Doesn’t Belong?’ Is the Smartest 5-Minute Routine in My Classroom

Every once in a while, you stumble on an activity that just clicks with your students. And for me, that’s Which One Doesn’t Belong? These quick little slides spark so much conversation, curiosity, and deep thinking in my classroom. The best part? There’s no single right answer. My first graders love sharing their thinking, spotting patterns I never would’ve noticed, and backing up their ideas with evidence. It’s critical thinking wrapped in fun and it’s become a daily favorite activity.

Why WODB Works

What makes these slides so powerful? They foster a growth mindset, invite deeper thinking, and value every student's voice. There isn't just one correct answer. Kids quickly learn that math is about noticing patterns and making connections not just getting the ‘right’ answer. It’s also a built-in formative assessment tool: I can instantly see who’s applying the skills taught so far this year.

Here are a few of my students’ actual explanations.

Using Them in My Classroom

I use WODB slides for morning work, number talks, mini-lessons, or literacy warm-ups. They’re perfect for partners, centers, early finishers, independent work or even sub plans. The black-and-white printables make it easy to send home or slip into journals. Have a few minutes?  These are a perfect quick activity with a big payoff! 

Give WODB a Try for Free

What Others Are Saying

I'm not the only one who loves using them in my classroom!  Take a look at what other's have said about using my Which One Doesn't Belong Slides:

If you’re looking for an easy way to boost math talks, build reasoning skills, and sneak in some formative assessment without it feeling like “work,” give Which One Doesn’t Belong? a try this month.

Have you used WODB in your classroom?  Does your class love them as much as mine?  Let me know!