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  • Author or Editor: David B. Spangler x
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David B. Spangler

One way to warm up on a brisk winter day is to imagine yourself on a sun-drenched back green of a golf course in high summer. To aid the imagination, consider the following:

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David B. Spangler

Detective Shirley Solvit is shopping for a new stom door. She knows that youngsters play baseball near her backyard-and that some of Them can really slam the ball. To reduce her chances of getting a broken window. she want to buy the door that will have the greatest chance of surviving these neighborhood sluggers.

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David B. Spangler

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David B. Spangler

Something is wrong with each of the advertisements to the right. Are the mistakes honest errors—or is someone trying to “pull the wool over our eyes”? Sometimes it is hard to tell for sure. But we can put on our detective hat to investigate what these advertisements are saying mathematically. The questions that follow will help us determine whether the bananas are “a-peeling,” whether the lamps are a “shady” deal, and whether the CDs should be “music to your ears.”

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David B. Spangler

Cryptology is the Science of Secret Communication. The word derives from the Greek kryptos, meaning “hidden,” and logos, meaning “word.” People have wanted to communicate secretly for a long time. In fact, code writing is about as old as writing itself.

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David B. Spangler and Katie A. Hendrickson

A cartoon, asking students to solve for x, is coupled with a full-page activity sheet.

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Hoyun Cho, David B. Spangler and Katie A. Hendrickson

A cartoon exploring an issue of finances is coupled with a full-page activity sheet.

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David B. Spangler and Katie A. Hendrickson

Edited by Hoyun Cho

A cartoon exploring various math thought bubbles is coupled with a full-page activity sheet.