Charlie Bardey shows different ways to make 10 when adding two numbers. Charlie Bardey is planning a picnic for friends. He needs to tally the number of people who would like bananas or strawberries.

What do the integers have in common with the symmetries of a triangle? In the 19th century, mathematicians invented groups as an answer to this question. Mathematics started with numbers — clear, ...

I’m convinced there are two kinds of nerds: word game people and number game people. The same thrill I feel at building letters into words, other people feel by manipulating numbers into different ...