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Yes, 111 is a rational number.
10% of 111 is 11.1
1, 3, 37, 111.
The number 111 in binary would be 1101111
111 is composite. If the sum of the digits in the number is divisible by 3, then the number itself is. 1+1+1 = 3, therefore 111 is divisible by 3. 111/3=37 37 is prime, so the prime factorisation of 111 is 3x37.