by Pat Baggett and Andrzej Ehrenfeucht
Explore new and historical ways to count, add, multiply, and divide. These lessons show that there's more than one way to do arithmetic!
Explore the foundations of counting and number sense.
Discover a powerful ancient multiplication technique using doubling and halving.
Learn a fresh approach to adding columns of numbers.
Explore an alternative multiplication method that may surprise you!
A new way to think about and perform long division.
Web and Graphic Implementation by Jenna McClellan · Last modified: June 4, 2018