The 103 means you need to move the decimal point to the right three spaces to convert to standard notation. So 7.83 x 103in2 = 7830in2 in standard notation.
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Expanded Notation of 783 = (7 x 100) + (8 x 10) + (3 x 1)
10-3 in standard notation is 0.001
0.008 in standard notation is: 8.0 × 10-3
5.9 × 10-10 written in standard notation is 0.00000000059
39.3 in standard notation = 3.93 x 10^1