9.09 is a decimal.
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It is 9.1
909/100
18 (eighteen) is an integer and does not need to be "converted to a decimal"1/8 (one eighth) is a fraction and can be converted into a decimal: 0.125
0.125
0.125
0.5
It is 0.2
.25
2.5
0.16666 repeating
910.
It is: 1/10 = 0.1
1/8 = 0.125