10.5 can be written as 10 1/2 or 21/2. 0.5 is the same is 5/10, which can be simplified to 1/2, making your mixed number answer 10 1/2. You can also write it as 21/2 by multiplying the whole number (10) by the denominator (2) and adding the numerator (1), which will be your new numerator over the same denominator (2).
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105 is an integer and so there is no sensible way to represent it as a fraction.
You can convert any integer into a fraction, by putting the integer into the numerator, and 1 into the denominator. Thus, 105 = 105/1.
105/1000 = 21/200
105% = 21/20 OR 1.05
105% =1.05105/10021/201 1/20