An easy way is to convert them to decimal, subtract, then convert the answer back to binary.
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By the signs: 2+2(Add) 2-2(Subtract) +=add -=subtract
Binary numbers are written with two symbols, 0 and 1. It is not about counting by 2, any number can be written as a binary number, with the correct sequence of zeros and ones.
Not 2 numbers - 2 digits. The digits 0 and 1.
-- The decimal system (base-10) uses 10 digits to write all numbers. -- The binary system (base-2) uses 2 digits to write all numbers.
No, 0101111 is not a binary number. Binary numbers are composed of only 0s and 1s, representing the base-2 numeral system. The presence of the leading zero in 0101111 suggests that it may be a binary number, but the inclusion of the digit 2 (represented as '11' in binary) indicates it is not a valid binary representation.