log 210 = log (10 * 7 * 3)

log (10 * 7 * 3) = log 10 + log 7 + log 3

Since log 10 = 1, and base 10 is being used, then log 5 = 0.699 is NOT needed.

Thus, log 210 becomes: log 10 + log 7 + log 3, which becomes: 1 + .845 + .4771, or  

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