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Higinio Dominguez and Melissa Adams

Complement teacher noticing with student noticing to enhance the teaching and learning of estimation.

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Jon R. Star, Martina Kenyon, Rebecca M. Joiner, and Bethany Rittle-Johnson

The ability to estimate is not only a valuable math skill but also an essential life skill. Many adults use estimation daily: when tipping a waitress, determining the cost of a sale item, or converting units. Within mathematics, the ability to estimate is linked to deep understanding of place value, mathematical operations, and general number sense (Beishuizen, van Putten, and van Mulken 1997) and allows students to check the reasonableness of their answers to mathematics problems in a variety of contexts.

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Peter T. Malcolm and Robert Q. Berry III

Technology from the Classroom is the venue for sharing articles that illustrate the effective use of technology in pre-K—grade 6 mathematics classrooms.

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Jennifer Suh

Post Script items are designed as rich “grab and go” resources that any teacher can quickly incorporate into their classroom repertoire with little effort and maximum impact. This article shares ideas for using a clothesline number line to build understanding of number relationships across the elementary grades.

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Temple A. Walkowiak

This is the second in a series of articles about the progression documents. The first one, on fractions, appeared in the November 2014 issue of Teaching Children Mathematics.

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Jennifer Suh and Padmanabhan Seshaiyer

Foundational in understanding place value and our decimal number system, this concept is explored through a practiced-based activity designed to develop teachers' technology knowledge for teaching mathematics. The activity focuses on number sense using online applets and various related models and representations.