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• Author or Editor: Megan H. Wickstrom
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## Volume is a treat

Finding volume is not always an easy task. Students need hands-on experiences with volume units to make sense of three dimensions. Comparing the quantity of familiar objects helps students foster conceptions of volume because the task requires attention to attributes, counting strategies, and connections to multiplication and capacity.

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## Piecing It Together

Use quilting as a context to relate area to perimeter as well as an opportunity to examine second graders' conceptions and misconceptions about measurement.

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## Developing Preservice Teachers’ Understanding of Area Through a Units Intervention

Preservice elementary teachers (PSTs) often enter their teacher preparation programs with procedural and underdeveloped understandings of area measurement and its applications. This is problematic given that area and the area model are used throughout K–Grade 12 to develop flexibility in students’ mathematical understanding and to provide them with a visual interpretation of numerical ideas. This study describes an intervention aimed at bolstering PSTs’ understanding of area and area units with respect to measurement and number and operations. Following the intervention, results indicate that PSTs had both an improved ability to solve area tiling tasks as well as increased flexibility in the strategies they implemented. The results indicate that PSTs, similar to elementary students, develop a conceptual understanding of area from the use of tangible tools and are able to leverage visualizations to make sense of multiplicative structure across different strategies.

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## Elementary Modeling: Connecting Counting with Sharing

Examine second-grade students' investigative processes, thinking, and revisions in this lesson using fish crackers.

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## Emphasizing the M in STEAM activities

Modifications to a first- and second-grade STEAM activity, Elephant Toothpaste, highlight ways to emphasize mathematical thinking by running multiple experiments, posing mathematical questions, and having students make both qualitative and quantitative observations. 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 5 classrooms.

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## Geometric Modeling: Determining the Largest Lake

During a middle school task, students compare the sizes of Lake Tahoe and Flathead Lake.

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## Bridging Modeling and Environmental Issues

The Great Pacific Garbage Patch activity involves an urgent environmental issue that students can discuss. It engages students in the interpretation of visual data, measurements, units, and the area of regular and irregular figures.

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## Inch by Inch, We Measure

Examine teaching strategies, students' conceptions and visualizations of length units, and conservation of length as first graders explore the meaning of an inch in the context of a garden inchworm.

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## Area Conceptions Sprout on Earth Day

Within the context of gardening, students examine rectangles with the same perimeter to see if and how their areas differ.

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## LEGOs: Linking Units, Operations, and Area

Use those multicolored linking bricks to help students connect measurement with an understanding of number and operations as well as fractions.