When one number goes in, another comes out. Scholars are introduced to math functions as they multiply, subtract, and divide numbers to get new ones. There are three functions and tables of numbers here; pupils apply the rule to each number in the first column, writing the resulting number in the next column. There is an example done in each. Numbers are all single or double-digit. Consider making this more fun by creating math machines which take in numbers and spit them back out.