Use a calculator to find the last digit in the number 2100. If you try to do this directly, you will get an answer that looks something like 1.2676506 E 30, which is the number written in what is called scientific notation that we discuss later in Chapter 6. That is not what we are asking you to do. If you instead consider the sequence of computations 2, 2 × 2, 2 × 2 × 2, 2 × 2 × 2 × 2, etc. until you see a pattern, that will allow you to predict the last digit in 2100.
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