What is 15/21 Simplified to Simplest Form?

Fraction Simplifier Calculator

What is 15/21 Simplified?

Answer: Fraction 15/21 simplified to lowest terms is 5/7

15

/

21

=

5

/

7

5/7 is the simplified fraction of 15/21.

Simplifying Fraction 15/21 using GCF

The first way to simplify the fraction 15/21 is to use the Greatest Common Factor (GCF) of our numerator [15] and denominator [21].

GCF of 15 and 21 is 3

And then divide both the numerator [15] and denominator [21] by the GCF [3].

15 ÷ 3

/

21 ÷ 3

=

5

/

7

Simplifying Fraction 15/21 using Prime Factors

Another method to reduce the fraction 15/21 to its simplest form is to use the Prime Factors of numerator [15] and denominator [21].

Prime Factors of 15: 3,5

Prime Factors of 21: 3,7

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

3 × 5

/

3 × 7

=

5

/

7

Simplifying Fraction 15/21 by Dividing by the Smallest Possible Number

In order to simplify our fraction we can start dividing both the numerator [15] 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.

15 ÷ 3

/

21 ÷ 3

=

5

/

7

Related Calculations

Fraction Simplification Table

Fraction	Lowest Terms
15/6	5/2
15/7	15/7
15/8	15/8
15/9	5/3
15/10	3/2
15/11	15/11
15/12	5/4
15/13	15/13
15/14	15/14
15/15	1/1
15/16	15/16
15/17	15/17
15/18	5/6 (⅚)
15/19	15/19
15/20	3/4 (¾)
15/21	5/7
15/22	15/22
15/23	15/23
15/24	5/8 (⅝)
15/25	3/5 (⅗)
15/26	15/26
15/27	5/9
15/28	15/28
15/29	15/29
15/30	1/2 (½)
15/31	15/31
15/32	15/32
15/33	5/11
15/34	15/34
15/35	3/7

Fraction Simplifier Calculator

This calculator will help you to simplify any fraction to its simplest form. For example, it can help you find out what is 15/21 Simplified? (The answer is: 5/7). Enter the fraction (numerator and denominator) (e.g. '15/21') and hit the 'Simplify' button.

Simplifying a fraction, (e.g. 15/21) means reducing it to its simplest form. A fraction is considered simplified if its numerator and denominator have no common factors other than 1 (one).

15/21 Simplified