# Professor B Mathematics — math

## Everard Barrett and His Effective Math program! Guest Blog from Mark Stolzberg, Ph.d.

Posted by **Mollie Shaw** on

## Number Sense and Fiveness

Posted by **Mollie Shaw** on

Number Sense is a complex understanding of the meaning of a number. Number sense is not memorizing a sequence of names of numbers and reciting them, like an advertisement jingle. Number sense is not memorizing facts such as one plus four equals five. Let's think about the number five. Five has character qualities like a person has personality. What do we know about five-ness? Being five means being half of ten, a very convenient thing! Being five means having parts such as two, three and four. Being five is like a four sided box with a dot in the middle...