Cool math Pre-Algebra Help Lessons: Exponents

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Coolmath Pre-Algebra
Exponents lesson 1 - What Are They? (page 1 of 3)
---- This pre-algebra lesson explains what exponents are and how they work.

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Let's do a bunch of multiplying!

2 x 2 = 4 ... 2 x 2 x 2 = 8 ... 2 x 2 x 2 x 2 = 16 ... 2 x 2 x 2 x 2 x 2 = 32 ... 2 x 2 x 2 x 2 x 2 x 2 = 64 ... 2 x 2 x 2 x 2 x 2 x 2 x 2 = 64 ... 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 = 128

Hey, we're going to run out of room pretty soon! What if we wanted to multiply twenty 2's together? I sure don't want to have to write that all out. What if it was a hundred 2's? Math geeks love math, but they don't want to have to write this all out either. So, we've got a cool way to write these guys.

2 x 2 x 2 (three of them) = 2^3 = 8

2 x 2 = 2^2 = 4 ... 2 x 2 x 2 = 2^3 = 8 ... 2 x 2 x 2 x 2 = 2^4 = 16 ... 2 x 2 x 2 x 2 x 2 = 2^5 = 32 ... 2 x 2 x 2 x 2 x 2 x 2 x 2 = 2^6 = 64 ... 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 = 2^7 = 128

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