Interestingly enough, 11/2 doesn't equal 5.5. This is because fractions are definite numbers while decimals are only accurate to the number of significant digits. So in this case 11/2=5.5000000000 (0s repeating) because of the definition while 5.5 is only accurate to two sig figs. 5.5 could also be 5.51 (rounded down) or 5.49 (rounded up), but 11/2 can never be expressed that way.

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