In a division sum, for example, 12 / 6 = 2, the first number in the sum is called the dividend. The second number is called the divisor, and the third number is the quotient. In this instance, it is the second number you are finding.
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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.