.9 is the same as 9/10
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If you mean 3*10 and 9/100 then it is 30.09 as a decimal
6.6
"9 tens" would be 90. If you meant to write "9 tenths" the answer would be 0.9
In the decimal system, the largest digit in any place is 9.
0.1 is equal to 10% because the tenths decimal point is the tens percentage.