18 cannot be a binary number as binary numbers are base two and each digit can only be 0 or 1.
If you are asking what is 18 in base 10 converted to base 2, then:
18 ÷ 2 = 9 r 0
9 ÷ 2 = 4 r 1
4 ÷ 2 = 2 r 0
2 ÷ 2 = 1 r 0
1 ÷ 2 = 0 r 1
reading the remainders in reverse order → 1810 = 100102
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Decimal 18 is 10010 in binary
Binary form of 18 is "10010"
Expressed as a decimal fraction, 18/100 is equal to 0.18.
.18
Expressed as a decimal, 18/25 is equal to 0.72.