Dividing any number by 1 equals the number you started with.
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This follows from the fact that 1 is the multiplicative identity for the set of real numbers (of which the set of rational numbers are a proper subset).
Because, 1 multiplied by a number or fraction will equal the same thing, that's what also happens with dividing by 1. I hope I helped!
I suppose you mean 1/9 (the fraction one ninth). To get 1/9 of a number is the same as dividing that number by 9.
Because doing so is equivalent to multiplying or dividing by x/x, which can be cancelled down to 1.
a fraction that can be changed by dividing it is called an improper fraction.
0.1 equals 1/10 as a fraction