Hard Math for Elementary School is new category of math book. The author calls it a math enrichment textbook. The idea is to make it easy for teachers or parents to supplement what kids are getting in school with with complementary lessons that are harder, deeper, and more fun.

Hard Math has chapters to accompany most textbook topics: addition with carrying, multiplication, fractions, etc. It covers other important topics - prime numbers, counting, probability - that are being squeezed out of many curricula. And it has chapters on topics which may not be as important -...

Hard Math for Elementary School: Workbook is a workbook to accompany the textbook of the same name. Together the books aim to provide kids who are not challenged by their regular schoolwork with lessons that are harder, deeper, and more fun. The Hard Math textbook (sold separately) is designed to supplement what kids are getting in school. It has chapters related most standard textbook topics: addition with carrying; multiplication; fractions; etc. It covers other important topics -prime numbers, counting, probability -that are being squeezed out of many curricula. And it has...