23
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The decimal number 23 corresponds to the binary number 10111.
10111
To find the sum of binary numbers 1100 and 1011, we add them together like in decimal addition. Starting from the rightmost digit, we add 0+1=1, 0+1=1, 1+0=1, and 1+1=10 (carry over the 1 to the next column). Therefore, the sum of 1100 and 1011 in binary is 10111.
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!
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 - Decimal 1 2 3 4 5 6 7 8 9 A B C D E F 10 11 12 13 14 - Hexadecimal 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 10110 10111 11000 11001 100000 - Binary The highest number you can express in 4 bits ("nibble) is decimal -15 - Hex -F