55.
101 in binary is 5.
there is a shortcut in getting the equivalent in binary.
421
if it is 1, then it's 001.
if it is 2, then it's 010.
if it is 3, then it's 011.
if it is 4, then it's 100.
if it is 5, then it's 101.
see? you just have to add the numbers that you need. you'll write 1 when you used the number that is needed and 0 when not.
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Binary(101) = Decimal(5).
The decimal number 101 is represented by the binary number 1100101.
Just as in decimal, you can put a minus sign in front. For example, if 101 (binary) is decimal 5, then -101 (binary) is decimal -5.
5 in base ten is 101 binary (4 + 0 + 1).
5