# Featured

## Dollar Words discoverd by Mathletes this week

Shortest dollar word ever found: NUTTY

OTHER DOLLAR WORDS:

session, immature, quarter, mittens, turkey, wizards, raincoats, posting, excellent, smitten, starfish, telephone, a ultraviolet ray, your bar, a comstock, stoves, putter, verdicts, varnished, delivery, a phi rocks

## Polygonal Numbers (10/20-26)

A Polygonal Number is a number represented as dots or pebbles in the shape of a polygon.

Use the graph paper provided and make different colored dots to count the triangular and square numbers. Eventually, each Mathlete should know the first 20 square numbers as they are used throughout

## Dollar Words and the Numerical Value of Famous Quotes (10-13 thru 10-17)

What are Dollar Words? Assign a cent value to each letter. So, let a = 1 cent, b = 2 cents, c = 3 cents, and so on up to z = 26 cents. For any word, add up the cent values of its letters. If they sum up to $1, it's a $1 word. You may want to verify that "maximize" and "reciprocal" are $1 words.

## Anti-Nines and Addition Magic (10-6 through 10-8)

Anti-nines are pairing numbers that sum to 9 like:

0 and 9,1 and 8, 2 and 7, 3 and 6, 4 and 5, 5 and 4, 6 and 3, 7 and 2, 8 and 1, 9 and 0

## Digital Roots Help Check Addition and Multiplication (classes 9-29 thru 10-5)

The digital root of a number is the number obtained by adding all the digits, then adding the digits of that number, and then continuing until a single-digit number is reached.