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 ...

"Numbers are a human invention, and they’re not something we get automatically from nature," says Caleb Everett. Kwangmoozaa/iStock Once you learn numbers, it’s hard to unwrap your brain from their ...