Explain an exponential number. Sal shows that 5 to the 3rd power is 5x5x5 while 5x3 is 5+5+5. He demonstrates that they have very different answers. Note: This is part 2 in a set of videos on exponents. It may serve students best if this video was shown first. It contains simpler problems that are worked completely. It also incorporates the idea that multiplication is repeated addition, while exponents are repeated multiplication.