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• "CCSS.Math.Content.5.NBT.A.1"
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## Insulating and conducting heat energy using STEM

Contributors to the iSTEM department share ideas and activities that stimulate student interest in the integrated fields of science, technology, engineering, and mathematics (STEM) in K–grade 6 classrooms. This article is a STEM lesson on insulators and conductors for heat energy.

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## Tracking Decimal Misconceptions: Strategic Instructional Choices

Strategic instructional choices can simultaneously address common decimal misconceptions and help students race toward decimal understanding.

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## The marriage of place and value

Students say some amazing things. Back Talk highlights the learning of one or two students and their approach to solving a math problem. Each article includes the prompt used to initiate the discussion, a portion of dialogue, student work samples (when applicable), and teacher insights into the mathematical thinking of students. This article investigates a student's understanding of the base-ten number system and how she uses her conceptions of place value to learn about the base-two number system.

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## Virtual Place Value

Compare how third graders think mathematically when using virtual versus concrete base-ten blocks to learn place-value concepts.

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Showcase students' in-depth thinking and work on problems previously published in Teaching Children Mathematics.

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Each month, a new problem, along with suggested instructional notes, is made available to elementary school teachers, who use the problem in their classrooms and report solutions, strategies, reflections, and misconceptions to the journal audience. The February problem, about the January 2013 presidential inaugural speech, includes a two-page student activity sheet.

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## Building Understanding of Decimal Fractions

Using grids can help students overcome confusion about place value.

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## Place Value as a Rate of Ten

Development of this multiplicative process involves unitizing within and across place.

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## What's in a (Sweet) Name?

This highly appropriate cartoon for March explores pi, coupled with an activity sheet.

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## A picture is worth 100 math ideas

Teachers share success stories and ideas that stimulate thinking about the effective use of technology in K—grade 6 classrooms. One way to keep young students engaged and interested in practicing counting is to involve them in using cameras. This article explains how first graders capture 100 images, use Windows MovieMaker or PhotoStory to turn the still images into a video, and then narrate a story using precise math vocabulary to explain their mathematical thinking.