Simplify 12/15

12/15 simplified is 4/5, after dividing the top and bottom by 3.

Result

Answer

\frac{12}{15} = \textcolor{#0b5c56}{\frac{4}{5}}

12/15 simplifies to 4/5.

  • Greatest common factor: 3
  • Decimal: \displaystyle 0.8
  • Percent: 80%
12/154/5

Same amount, fewer parts

Step-by-step solution

The problem

\frac{12}{15}

  1. Find the greatest common factor. List the factors of each:
    Factors of 12: 1, 2, 3, 4, 6, 12
    Factors of 15: 1, 3, 5, 15
    The greatest common factor (GCF) is 3.

    \text{GCF}(12, 15) = 3

  2. Divide the top and bottom by 3. Dividing both by the same number keeps the value the same.

    = \frac{12 \div 3}{15 \div 3} = \textcolor{#0b5c56}{\frac{4}{5}}

All the working together

\begin{aligned} &\frac{12}{15} \\[8pt] &= \frac{12 \div 3}{15 \div 3} && \textcolor{#5b6660}{\textsf{divide by 3}} \\[8pt] &= \textcolor{#0b5c56}{\frac{4}{5}}\end{aligned}

12/15 in other forms

Simplest form4/5
Greatest common factor3
Decimal0.8
Percent80%
Equal fractions8/10, 16/20, 20/25, 24/30

Fractions over 15 simplified

FractionSimplest formDecimal
1/15already simplest0.0666…
2/15already simplest0.1333…
3/151/50.2
4/15already simplest0.2666…
5/151/30.333…
6/152/50.4
7/15already simplest0.4666…
8/15already simplest0.5333…
9/153/50.6
10/152/30.666…
11/15already simplest0.7333…
12/154/50.8
13/15already simplest0.8666…
14/15already simplest0.9333…

Frequently asked questions

What is 12/15 in simplest form?

12/15 simplifies to 4/5. Divide the top and bottom by 3, their greatest common factor: 12 ÷ 3 = 4 and 15 ÷ 3 = 5.

What is the greatest common factor of 12 and 15?

The GCF of 12 and 15 is 3 – the biggest number that divides both with nothing left over.

Is 12/15 equal to 4/5?

Yes. Both are 0.8 (80%). Simplifying changes how the fraction is written, not its value.

More fractions to simplify

Any other fraction or mixed number: use the Simplify Fractions Calculator.