2 + 2 is an idea. Math is the kind of thinking that leads to ideas like 2 + 2. 2 + 2 is an idea about addition. If you get to 2 + 2 in your thinking, you might also get to ideas like counting, long division, prime numbers, and Sudoku puzzles. These ideas all come from the branch of mathematics known as Number Theory. Mathematics has many branches and people are always … [Read more...] about 2 + 2 and Math