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## Quick Blocks: Developing Spatial Sense

This article shares the importance of giving K-12 students opportunities to develop spatial sense. We explain how we designed Quick Blocks as an activity to engage our students in both spatial reasoning and number sense. Several examples of students thinking are shared as well as a classroom dialogue.

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## Mathematical Modeling in the High School Curriculum

Ideas from the GAIMME report illustrate how teachers can engage students in the modeling process.

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## Quick images for all

Postscript items are designed as rich grab-and-go resources that any teacher can quickly incorporate into his or her classroom repertoire with little effort and maximum impact. Quick images are a fun, engaging way for students to compose and decompose visual numbers. Students apply their understanding of subitizing–the ability to recognize a number of items without counting–as they determine the quantity of the group

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## Original Recipes for Matrix Multiplication

Frozen custard recipes are the starting point for students to derive and explain a method for multiplying matrices.

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## The Place and Purpose of Combinatorics

The union of curriculum goals intersects with math education standards.

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## Using Mathematics to Elect the U.S. President

The often misunderstood Electoral College is based on the simple, yet powerful, mathematical idea of proportional reasoning.

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## Mathematical Modeling with MyMaps and Spreadsheets

Available apps are used to develop and investigate an optimization problem.

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## A Study of Statistics Through Tootsie Pops

Students construct confidence intervals, write hypothesis tests, and use sampling data to evaluate claims–all by using candy wrappers.

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## Math for Real: The Top Speed for Humans

### “when will I ever use this?”

The running speed of athletes provides the real-life tie-in to this computation activity.

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## Six Principles for Quantitative Reasoning and Modeling

Modeling the motion of a speeding car or the growth of a Jactus plant, teachers can use six practical tips to help students develop quantitative reasoning.