Which One Doesn't Belong

A website dedicated to providing thought-provoking puzzles for math teachers and students alike. There are no answers provided as there are many different, correct ways of choosing which one doesn't belong. Enjoy! 

Math For Love

We are Dan Finkel and Katherine Cook, a husband and wife team devoted to transforming how math is taught and learned.

We develop math games and curriculum, including tons of free lesson plans that we give away here. We train teachers and produce professional learning materials. And we write puzzles, produce math-art shows, and do whatever we can to show people how playful, beautiful, and life-changing mathematics can be.

Fraction Talks

"Fraction Talks are a built around classroom talk and student action. These two principles guide the teacher’s questions, disposition, and facilitation of the activity. They can be become a daily routine, or used for entire lessons."

Estimation 180

Math Lessons that Build Number Sense

Estimation tasks that make mathematical reasoning accessible to students and enjoyable.

Visual Patterns 

Clothes Line Math 

Clotheslines become interactive number lines. Students are able to manipulate cards to show proportional reasoning, precision, equality between numbers, and magnitude. The clothesline builds students’ number sense. It’s a routine that can work from kindergarten through high school.

State of Maine Organizations

Maine Science Teachers Association

"Teachers and science professionals making science education happen in Maine’s schools and communities."

Association of Computer Technology Educators in Maine

"ACTEM's Mission is to enhance and influence education in Maine through the use of technology."

Maine Robotics

"Maine Robotics seeks to provide a supportive, mentoring atmosphere for teachers wishing to pursue advancement in the sometimes daunting world of engineering and computer science."

Maine Math Science Alliance 

Finding inspiring new ways to get people excited about Science, Technology, Engineering and Math today so that our youth can become the innovators and workforce of tomorrow.

Math Blogs 

dy/dan

Currently a doctoral candidate in mathematics education at Stanford University, Dan Meyer is interested in making perplexity accessible to students. He has developed a bank of what he calls "three-act" problems to have kids doing some actual problem solving. His video, Math Class Needs a Makeover, is a good place to begin if you're new to Dan's work.

Graham Fletcher 

Overthinking My Teaching 

Christopher Danielson teaches future elementary school teachers mathematics at Normandale Community College in Bloomington, Minnesota. He is particularly interested in children's mathematical development. You should also check out his new blog, Talking Math With Your Kids, where he chronicles conversations with his own children, Tabitha and Griffin.

STANDARDS & INSTRUCTION 

Common Core State Standards 

National Council of Teachers of Mathematics

"The public voice of mathematics education, supporting teachers to ensure equitable mathematics learning of the highest quality for all students through vision, leadership, professional development, and research."

National Council of Supervisors of Mathematics

"A mathematics leadership organization for educational leaders that provides professional learning opportunities necessary to support and sustain improved student achievement."

Math Resources

Achieve the Core

"This website is full of free content designed to help educators understand and implement the Common Core State Standards. It includes practical tools designed to help students and teachers see their hard work deliver results. achievethecore.org was created in the spirit of collaboration. Please steal these tools and share them with others."

youcubed

Founded by Jo Boaler, youcube's main goal is "to inspire, educate and empower teachers of mathematics, transforming the latest research on math mearning into accesible and practical forms."

Edutopia

Our Foundation is dedicated to transforming K-12 education so that all students can acquire and effectively apply the knowledge, attitudes, and skills necessary to thrive in their studies, careers, and adult lives. Founded by innovative and award-winning filmmaker George Lucas in 1991, we take a strategic approach to improving K-12 education through two distinct areas of focus: Edutopia and Lucas Education Research.