9/17/15 - G is for Googol

We read the book G is for Googol: A Math Alphabet Book by David M. Schwartz.  The book is full of math concepts ranging from abacus to zillion.  After reading the book, we had a longer discussion on the concept of symmetry.  We went through every letter of the alphabet and all ten digits and decided whether or not they were symmetrical.  There were a few letters that the kids thought should be symmetrical but weren't like the others so we briefly touched on rotational symmetry versus line symmetry.  Line symmetry applies to letters like T, H, and A but rotational symmetry works for N, S, and Z.  The letters O and X have both kinds of symmetry.