4/21 Simplified

The first way to simplify the fraction 4/21 is to use the Greatest Common Factor (GCF) of our numerator [4] and denominator [21].

GCF of 4 and 21 is 1

And then divide both the numerator [4] and denominator [21] by the GCF [1].

Another method to reduce the fraction 4/21 to its simplest form is to use the Prime Factors of numerator [4] and denominator [21].

Now we can write down a new fraction expressed by its Prime Factors and cancel common factors in numerator and denominator:

In order to simplify our fraction we can start dividing both the numerator [4] and denominator [21] by the smallest possible number (2,3,4,5... and so on), and repeat this until it is impossible to divide without a reminder.

In our case (4/21) there is no possible numbers to divide our numerator and denominator.