399/21 Simplified

The first way to simplify the fraction 399/21 is to use the Greatest Common Factor (GCF) of our numerator [399] and denominator [21].

GCF of 399 and 21 is 21

And then divide both the numerator [399] and denominator [21] by the GCF [21].

Another method to reduce the fraction 399/21 to its simplest form is to use the Prime Factors of numerator [399] 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 [399] 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 remainder.