The mass of an object is how heavy it is. The amount of matter in an object is its mass. You can use the words 'heavy' and 'light' to describe the mass of an object. You can use the words 'heavier' ...

In pre-kindergarten, children ages 3-5 develop a basic understanding of numbers and counting, and connect both to the idea of “how many.” Pre-k math tips work on recognizing, grouping, and comparing ...

When you compare numbers, you find out which is bigger and which is smaller. You can use the words 'less than', 'greater than' or 'equal to' to compare numbers. Each phrase has a matching symbol that ...

You may have seen graphics comparing the objects in our solar system by size, but this visualization offers a slightly different spin on the theme, by comparing ...