In order to graduate from high school, people usually spend about13 years (K-12) learning about math concepts. One of the things that math does is to give us a universal way to think about quantities.

Simplify \(6:1.5\). A room has to be painted blue and yellow in the ratio \(2:3\). Express the proportion of the room that has to be painted in each colour as a fraction. There are five parts in this ...

In this chapter, we look beyond the whole numbers at other numbers that are included in school mathematics in grades pre-K to 8, particularly in the upper grades. We first look at the rational numbers ...