The following is an excerpt from Beyond Infinity: An Expedition to the Outer Limits of Mathematics, by Eugenia Cheng Mathematics can be thought of as many things: a language, a tool, a game. It might ...

The other day, my four-year-old son asked me, point blank: —Dad, can you count to infinity? —No son, you can't, it would take forever. —But what's infinity minus three?" —It's infinity, too. —But how ...

When you estimate a number you decide approximately, or roughly, how big that number is. To estimate accurately, you need to have a good understanding of the value and order of numbers. A number line ...