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### Collecting The Rays

### Competing Coasters

### What Is the Best Chip?

*Teaching Children Mathematics*.

### Every Breath You Take

### Parking at the Mall

### What Comes Nex_?

*Teaching Children Mathematics*Vol. 2, no. 2.

### Weather Watchers

Students collect and analyze data about the weather and learn to make a stem-and-leaf plot. Students use newspapers, the Internet, or other sources to collect weather data.

This lesson was adapted from "Finding Our Top Speed", as found in *Mission Mathematics II: Grades 6–8*, a joint NASA/NCTM project, NCTM
2005.

### Water, Water

### The Variable Machine

This lesson provides an introduction to the use of variables, and develops students' algebraic thinking. Students create variable machines to discover the value of words.

This lesson was adapted from a lesson by Gilbert Cuevas and Karol Yeatts, as found in *Navigating Through
Algebra in Grades 3 ‑ 5*, from the *Navigations* Series, NCTM 2001.