About this product

This compilation is aimed at familiarizing oneself with the process of adding and subtracting numbers (1 - 99) done with the use of both hands. The lessons are presented in a progressive manner starting with one hand first then the other before finally using both to add or subtract two - digit numbers.
The number were so selected so that addition or subtraction does not result to a negative value. The difficulty is also presented in an increasing format starting with the use of 5, 10 then 50 when regrouping using its complements. Exercises are provided by the end of each lesson to aid in the process of muscle memory by opening or closing specific fingers or the entire fist.
The use of both hands in adding and subtracting counting numbers is simply a means to the ultimate goal which is to be able to perform addition and subtraction mentally as read or dictated by doing the exact sequence of operations from left to right.