If I said “3!“, would you think the 3 is really excited, or that you have to shout the number?
In fact, it’s a mathematical operation called factorials, and boy are they fun! They may seem complicated at first, but they’re really a very basic concept. The exclamation point behind a number means that you multiply that number by each successively lower number, in order, until you get to one.
So 3! would be 3 x 2 x 1 = 6.
Take a look at the video for an explanation of how factorials work and how they can be used.
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These videos make math so cool! Now I understand the practical applications of factorials, and I can understand how 0! equals 1 – in two different ways! Did I mention that my brother and I love to play Bagels now? 😀
Mary Crawford (age 12)