My youngest son is a whiz at math - as long as he can figure out problems in his head. But his uncanny ability to make sense of numbers is lost when he looks at a formulaic math problem. When he was ...

A concrete method for multiplication. When your child first learns to multiply two two-digit numbers, she will use the area model. This visual tool illustrates how to decompose numbers and find four ...

In two papers from 1938 and 1939, D. H. Lehmer computed the partial quotients an in the continued fraction for π up to a100 (cf. references p. 68). Without knowing Lehmer's work, the author in 1945 ...