9/21 Simplified
The fraction 9/21 written in its simplest form.
9/21 in simplest form
3/7
= 0.428571 as a decimal · 42.8571% as a percentage
How it works
To reduce a fraction, divide the numerator and denominator by their greatest common factor (GCF).
- GCF of 9 and 21 = 3
- 9 ÷ 3 = 3
- 21 ÷ 3 = 7
So 9/21 = 3/7, which cannot be reduced further because 3 and 7 share no common factor other than 1.
Equivalent fractions
9/21 = 3/7 = 6/14 = 9/21 = 12/28 — all equal to 0.428571.
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Frequently asked questions
What is 9/21 in simplest form?+
9/21 simplifies to 3/7. Both the numerator and denominator share a greatest common factor of 3, and dividing each by 3 gives 3/7.
How do you simplify 9/21?+
Find the greatest common factor (GCF) of 9 and 21, which is 3, then divide the top and bottom by it: 9 ÷ 3 = 3 and 21 ÷ 3 = 7, giving 3/7.