Wednesday, March 17, 2010

history of mathematic

We are now doing history of mathematic using
I bought this book from Book Depository because it's cheaper
compared to other online bookstores
(free shipping worldwide).
There are at least one hands-on every chapter.
Here is a Native American-styled "animal skin" tally marks.
(we didn't do the chicken bone tally stick, our cat ate the bone!!)
This is an Inca Quipu.
(count and add-on with knots)
While reading this book to XP,
she drew this picture.

1 comment:

  1. love your blog. i have 2 kids\gals. keep your blog growing...