103.
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10 to the power of 3. 103
10 to the power 3 means 10*10*10, or 1000 10 to the power MINUS 3 means 1 over 10 to the power 3, so 1/1000.
1000*105 = 100000000.
It is: 10 because 10^3 = 1000
1000 = 10 to the third so 10 to the ninth ie 1,000,000,000