Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Today we're investigating how numbers can be represented in different ways. It's important that we ...

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 ...

After 15 years of inquiry into children’s understanding and learning of whole numbers, I can sum up what I have learned very simply. To teach math, you need to know three things. You need to know ...

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Hello! Today we're going to learn to order some numbers. This is a number line. It helps us space out ...