If it says x (division symbol) y, then it's the first number. Same with x/y. Divide into x.
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Dividing by decimal is different from dividing by whole number as you have to multiply by a number to remove the decimal.
Divisor
No. By definition, 20% is equal to 0.2. Multiplying a number by 0.2 is not equal to dividing it by four. Finding 25% of a number is equal to dividing that number by 4. Finding 20% of a number is equal to dividing that number by 5.
This is related to the fact that dividing by a number is the same as multiplying with the number's reciprocal.
A rational number is, by definition, the answer from dividing one integer by another.