Simplify 12/18

12/18 simplified is 2/3, after dividing the top and bottom by 6.

Result

Answer

\frac{12}{18} = \textcolor{#0b5c56}{\frac{2}{3}}

12/18 simplifies to 2/3.

  • Greatest common factor: 6
  • Decimal: \displaystyle 0.\overline{6} (the 6 repeats forever, about 0.6667)
  • Percent: 66.67%
12/182/3

Same amount, fewer parts

Step-by-step solution

The problem

\frac{12}{18}

  1. Find the greatest common factor. List the factors of each:
    Factors of 12: 1, 2, 3, 4, 6, 12
    Factors of 18: 1, 2, 3, 6, 9, 18
    The greatest common factor (GCF) is 6.

    \text{GCF}(12, 18) = 6

  2. Divide the top and bottom by 6. Dividing both by the same number keeps the value the same.

    = \frac{12 \div 6}{18 \div 6} = \textcolor{#0b5c56}{\frac{2}{3}}

All the working together

\begin{aligned} &\frac{12}{18} \\[8pt] &= \frac{12 \div 6}{18 \div 6} && \textcolor{#5b6660}{\textsf{divide by 6}} \\[8pt] &= \textcolor{#0b5c56}{\frac{2}{3}}\end{aligned}

12/18 in other forms

Simplest form2/3
Greatest common factor6
Decimal0.666… (the 6 repeats forever)
Percent≈ 66.67%
Equal fractions4/6, 6/9, 8/12, 10/15

Fractions over 18 simplified

FractionSimplest formDecimal
1/18already simplest0.0555…
2/181/90.111…
3/181/60.1666…
4/182/90.222…
5/18already simplest0.2777…
6/181/30.333…
7/18already simplest0.3888…
8/184/90.444…
9/181/20.5
10/185/90.555…
11/18already simplest0.6111…
12/182/30.666…
13/18already simplest0.7222…
14/187/90.777…
15/185/60.8333…
16/188/90.888…
17/18already simplest0.9444…

Frequently asked questions

What is 12/18 in simplest form?

12/18 simplifies to 2/3. Divide the top and bottom by 6, their greatest common factor: 12 ÷ 6 = 2 and 18 ÷ 6 = 3.

What is the greatest common factor of 12 and 18?

The GCF of 12 and 18 is 6 – the biggest number that divides both with nothing left over.

Is 12/18 equal to 2/3?

Yes. Both are 0.666… (≈ 66.67%). 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.