21/81 Simplified

The first way to simplify the fraction 21/81 is to use the Greatest Common Factor (GCF) of our numerator [21] and denominator [81].

GCF of 21 and 81 is 3

And then divide both the numerator [21] and denominator [81] by the GCF [3].

Another method to reduce the fraction 21/81 to its simplest form is to use the Prime Factors of numerator [21] and denominator [81].

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 [21] and denominator [81] by the smallest possible number (2,3,4,5... and so on), and repeat this until it is impossible to divide without a reminder.