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35 already is an integer.
Do nothing. 50 is already an integer.
Not necessarily, for example: If you subtract 3 from 4, then you get +1. But if you subtract 4 from 3, you get -1. The answer will always be an integer, but you cannot make a general statement about the sign, without knowing more information.
That integer is ' 85 '. Since it's used to represent 85, mathematicians decided to make it look just like 85 in order to make it easier to remember.
You can convert any integer into a fraction, by putting the integer into the numerator, and 1 into the denominator. Thus, 105 = 105/1.