In the same way that the columns of a decimal number represent powers of ten (ones, tens, hundreds, thousands, ... or 100, 101, 102, 103, ...), the columns of a binary number represent powers of two (ones, twos, fours, eights, ... or 20, 21, 22, 23, ...).
In the number you're given, you have eight digits, so your leftmost column is multiplied by 27 and your rightmost column by 20. So you can rewrite the number like this:
1×27 + 0×26 + 1×25 + 1×24 + 1×23 + 0×22 + 1×21 + 1×20
= 1×128 + 0×64 + 1×32 + 1×16 + 1×8 + 0×4 + 1×2 + 1×1
= 128 + 0 + 32 + 16 + 8 + 0 + 2 + 1
= 187
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11101
The question is a little vague, so Ill answer it both ways.1010 in binary is 10 in decimal â—„1010 in decimal is 1111110010 in binary â—„
Every decimal number can be represented by a binary number - and conversely.
Decimal 11 = binary 1011
There is no decimal number for the binary number 13 because 13 cannot be a binary number.