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• Author or Editor: Jeremy F. Strayer
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## Technology Tips: Sample Too Small? Probably Not!

Using the TI-Nspire, students can see that polling results from a small group will suffice for determining the opinion of the whole population.

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## Using GeoGebra to Help Students Understand the Inverse Cosine Function

GeoGebra is an extremely powerful tool for mathematics teaching and learning. In this article, we share how to create a GeoGebra worksheet that can be used to display dynamically changing quantities. This worksheet can support students as they make meaning of the inverse cosine function.

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## Number Talks for Statistics and Probability

Short, mathematical discussions can elicit students' reasoning and focus on foundational ideas.

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An inquiry-based project to examine statistical claims encourages students to become more savvy media consumers.

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## Kick-Starting Discussions with the Flipped Classroom

A four-phase process and three principles for building a mathematics learning community use rich discussion of student work.

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## Reverse and Add to 100: Explorations in Place Value

A collaborative number quest challenges third graders to strengthen their understanding of patterns, multidigit addition, and number operations

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## Examining Mistakes to Shift Student Thinking

During a lesson on ratios involving percentages of paint, four research-based criteria are used to evaluate students' mistakes. The takeaway is that painting all mistakes with the same brush can also be a blunder.

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## Because We Love

Explore what it means to balance love for mathematics with love for students.

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## Making Room for Inspecting Mistakes

Select errors to discuss in class, and try these three alternative lesson ideas to leverage them and move students toward deeper understanding.

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## Inspection-Worthy Mistakes: Which? And Why?

Carefully select and leverage student errors for whole-class discussions to benefit the learning of all.