10.9 is a decimal which can also be written as 10 and 9/10
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109 tenths in decimal form = 10.9
109/6 = 181/6
You move the decimal left or right until you end up with one digit in front of the decimal. Then, if you had to move the decimal to the left to get this number, you will have ten to the positive power of the number of decimal places moved. If you had to move the decimal to the right to get the number, you will have ten to the negative power of the number of decimal places moved. In this example, 5217000000 = 5.217 x 109
If the question is about 8.428*109, then it is 8,428,000,000.
Expressed as a mixed number in its simplest form, 10.9 is equal to 10 9/10 or ten and nine tenths.