The decimal number 23 corresponds to the binary number 10111.
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10111
23
This is in Binary Code. I think you mean, what is it in decimal. 010111 is 1 + 10+100 + 10000 2^0 +2^1 + 2^2 + 2^4 = 1 + 2 + 4 +16 = 23 in Decimal.
No - the eight-bit binary code for 53 is 00110101 - if counting the binary number, when increasing the powers of two which you add together, you have written the indices at the top of the column in the wrong direction - it is the rightmost digit which starts at 20, increasing to 21, 22, 23, etc...
Well, darling, the answer to 10111 times 111 in binary base is 1000101. It's as simple as that. Just do the multiplication like you would in regular base 10, but with binary numbers instead. Voilà!