Simplify 9/18

9/18 simplified is 1/2, after dividing the top and bottom by 9.

Result

Answer

\frac{9}{18} = \textcolor{#0b5c56}{\frac{1}{2}}

9/18 simplifies to 1/2.

  • Greatest common factor: 9
  • Decimal: \displaystyle 0.5
  • Percent: 50%
9/181/2

Same amount, fewer parts

Step-by-step solution

The problem

\frac{9}{18}

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

    \text{GCF}(9, 18) = 9

  2. Divide the top and bottom by 9. Dividing both by the same number keeps the value the same.

    = \frac{9 \div 9}{18 \div 9} = \textcolor{#0b5c56}{\frac{1}{2}}

All the working together

\begin{aligned} &\frac{9}{18} \\[8pt] &= \frac{9 \div 9}{18 \div 9} && \textcolor{#5b6660}{\textsf{divide by 9}} \\[8pt] &= \textcolor{#0b5c56}{\frac{1}{2}}\end{aligned}

9/18 in other forms

Simplest form1/2
Greatest common factor9
Decimal0.5
Percent50%
Equal fractions2/4, 3/6, 4/8, 5/10

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 9/18 in simplest form?

9/18 simplifies to 1/2. Divide the top and bottom by 9, their greatest common factor: 9 ÷ 9 = 1 and 18 ÷ 9 = 2.

What is the greatest common factor of 9 and 18?

The GCF of 9 and 18 is 9 – the biggest number that divides both with nothing left over.

Is 9/18 equal to 1/2?

Yes. Both are 0.5 (50%). 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.