Simplest form answer

12/15 Simplified = 4/5

12/15 in simplest form is 4/5, found by dividing 12 and 15 by their greatest common factor, 3. As a decimal 4/5 is 0.8, and as a percent it is 80%.

Simplified

4/5

Decimal

0.8

Percent

80%

Step-by-step GCF reduction

1. Find the greatest common factor.

The GCF of 12 and 15 is 3.

2. Divide the numerator and denominator by the GCF.

12 ÷ 3 = 4

15 ÷ 3 = 5

3. Write the result.

12/15 simplified is 4/5.

Decimal and percentage equivalents

Decimal equivalent

4/5 = 0.8

Percentage equivalent

4/5 = 80%

Visual fraction bar

80%

The filled part represents 4/5 of one whole.

Cite this result

Quoting this answer in homework, a lesson plan, or an article? Copy a ready-made citation.

12/15 in simplest form is 4/5, found by dividing 12 and 15 by their greatest common factor, 3.
ILoveFractions, https://www.ilovefractions.com/tools/fraction-simplifier/12-15/, retrieved September 2, 2026

APA

ILoveFractions. (2026). 12/15 Simplified = 4/5. ILoveFractions.com. Retrieved September 2, 2026, from https://www.ilovefractions.com/tools/fraction-simplifier/12-15/

MLA

"12/15 Simplified = 4/5." ILoveFractions.com, https://www.ilovefractions.com/tools/fraction-simplifier/12-15/. Accessed 2 September 2026.

Need to simplify a different fraction?

Use the main fraction simplifier for any numerator and denominator.

Open the Fraction Simplifier