13.2 Traditional Divisibility Rules…213
13.3 Non-Traditional Divisibility Rules…214
13.4 Prime & Composite Numbers…218
13.5 Strategies for Finding Greatest Common Divisor…222
13.6 Strategies for Finding Least Common Multiple…225
13.7 Practice Exercises for Chapter 13…228
This chapter will introduce you to divisibility rules traditionally taught as well as divisibility rules that should be taught but are not for some unknown reason. You will be introduced to a non-traditional strategy for finding the greatest common divisor dating back to 300 B.C. and a non-traditional strategy for finding least common multiple.
This material will mainly be taught in the upper elementary grades. But, these methods could be used throughout a student's education to reinforce or improve their ability to work with fractions.
The material in this chapter will go far in taking fractions from a feared topic to a user friendly topic.
Remember your goals and keep the problems simple and targeted towards your goals. Giving students extremely difficult and large problems does not make the better problem solvers, it only creates a dislike for math.