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## Delving Deeper: What Else Comes after 1 + 2 = 3?

The simplest of prekindergarten equations, 1 + 2 = 3, is the basis for an investigation involving much of high school mathematics, including triangular numbers, arithmetic sequences, and algebraic proofs.

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## GPS: Interpreting Whole-Number Remainders

Growing Problem Solvers provides four original, related, classroom-ready mathematical tasks, one for each grade band. Together, these tasks illustrate the trajectory of learners’ growth as problem solvers across their years of school mathematics.

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## A New Twist on Fraction Equations

The authors introduce an activity involving “follow-up equations” to connect with ideas children have already expressed during fraction problem solving.

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## Exploring Geometry with Origami One-Cut-Heart

One-Straight-Cut-Heart activities can help teachers support students’ engagement with geometry and can deepen students’ geometric reasoning.

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## Understanding Similarity through Dilations of Nonstandard Shapes

This set of tasks progressively engages students in geometric proportional reasoning.

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## GPS: The Dog Leash Problem

Growing Problem Solvers provides four original, related, classroom-ready mathematical tasks, one for each grade band. Together, these tasks illustrate the trajectory of learners’ growth as problem solvers across their years of school mathematics.

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## Promoting Equitable Problem Solving with Numberless Math Stories

Use these three strategies to support student perseverance and discourse about context.

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## Recalibrating Beliefs and Teaching Practices

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## Sibling Longevity

We explore the statistical likelihood of one, or more, siblings in a family of nine surviving to 100 years of age.

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## Problem Posing through Young Adult Literature

Young adult literature can be used in secondary mathematics classrooms as a tool for students to develop and explore their own mathematical questions.