Who needs Xtreme Arithmetic? Nearly everyone. Students, parents and
teachers who use or teach addition, subtraction, multiplication and division.
Whether you are learning, preparing for SATs, work with numbers every
day, or just want your friends to think youre a math whiz, you can benefit
from learning the Xtreme Arithmetic system.

Xtneme Arithmetic Ebook begins with one of the tools in the Numdrum series
designed by British engineer and mathematician John Harrison. Use it when
you begin to teach children about numbers, from pre-school to first grade.
Skip this chapter if you are not teaching those grades.

Numdrum is a wonderful visual aid that gives children the concepts they need
to comprehend the basics of addition, subtraction, multiplication and, to some
extent, division. Avoid three of the greatest problems children encounter
when you use a Numdrum to teach basic arithmetic.