8.23 x 109 = 8,230,000,000
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Ten times nine equals ninety.
1,000,000,000
91.4444
9+90=99 (90 is ten times as much as 9)
To multiply something by a power of ten, as here, add 4 zeros after the nine (since the power is 4). In the case of a decimal (such as 9.14 times ten to the power 6), move the decimal point (in this example) six positions to the right, filling out with zeros where required.