They're both numbers.
The numerator is how many you have, and the factors are numbers that go into a number, so they are both parts of parts or fractions/decimals.
They are related because you can comvert decimals into fractions,and fractions into decimals.
fractions are parts of a number
Two fractions are related when the denominator of one of the fraction is a multiple of the denominator of the other fraction. (Don't confuse with Like fractions)
You may have answered your own question. Equivalent fractions have common factors. If they don't have common factors, they aren't equivalent.
Related concepts to fractions include ratios, proportions, percents, decimals, probabilities, cents, division, inverses. Parts of fractions are numerator and denominator. Fractions greater than 1 are improper fractions or mixed numbers.
Math is related to fractions. if you look in a math book or just online then one of the math topics is fractions. You learn how to divide, multiply, add and subtract, simplify and more about fractions and what to do with them.
Factors refer to whole numbers, not fractions.
the factors of 7 are 1 and 7
Factors refer to whole numbers, not fractions.
Factors refer to whole numbers, not fractions.
I think that you meant factors, not fractions. If you meant factors, then it would be 7 and 3. If you did mean fractions, then it would be 0/21 and 210/21.