100
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A negative exponent is the reciprocal of the corresponding positive exponent. 102 = 100 10-2 = 1/100
10 log10 (100) or 10 (the exponent of 10 that gives you 100) 10 (2) 20
420 = 4.2 × 102
10^5
330.1 x 10-2. You move the decimal point two places to the left.