A fraction is in lowest terms when the numerator and denominator share no factor other than 1.
How to use the Simplify Fractions Calculator
- Numerator
- Denominator
Results update as you type, and every field accepts the units shown in its menu.
How it works
Find the greatest common factor of the two numbers and divide both by it.
Inputs explained
| Field | What to enter |
|---|---|
| Numerator | A number |
| Denominator | A number |
What each result means
- Greatest common factor = gcd([Numerator], [Denominator])
- Simplified numerator = [Numerator] ÷ [Greatest common factor]
- Simplified denominator = [Denominator] ÷ [Greatest common factor]
- Decimal = [Numerator] ÷ [Denominator]
Formula
Simplified = (n ÷ gcd) / (d ÷ gcd)Worked example
Inputs — Numerator: 84; Denominator: 126.
Results — Greatest common factor = 42; Simplified numerator = 2; Simplified denominator = 3; Decimal = 0.66666667.
Frequently asked questions
Do I need to simplify answers?
Teachers usually expect lowest terms unless told otherwise.
What if the GCF is 1?
The fraction is already in lowest terms.
What formula does the Simplify Fractions Calculator use?
Simplified = (n ÷ gcd) / (d ÷ gcd).