Simplify 18/20

18/20 simplified is 9/10, after dividing the top and bottom by 2.

Result

Answer

\frac{18}{20} = \textcolor{#0b5c56}{\frac{9}{10}}

18/20 simplifies to 9/10.

  • Greatest common factor: 2
  • Decimal: \displaystyle 0.9
  • Percent: 90%
18/209/10

Same amount, fewer parts

Step-by-step solution

The problem

\frac{18}{20}

  1. Find the greatest common factor. List the factors of each:
    Factors of 18: 1, 2, 3, 6, 9, 18
    Factors of 20: 1, 2, 4, 5, 10, 20
    The greatest common factor (GCF) is 2.

    \text{GCF}(18, 20) = 2

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

    = \frac{18 \div 2}{20 \div 2} = \textcolor{#0b5c56}{\frac{9}{10}}

All the working together

\begin{aligned} &\frac{18}{20} \\[8pt] &= \frac{18 \div 2}{20 \div 2} && \textcolor{#5b6660}{\textsf{divide by 2}} \\[8pt] &= \textcolor{#0b5c56}{\frac{9}{10}}\end{aligned}

18/20 in other forms

Simplest form9/10
Greatest common factor2
Decimal0.9
Percent90%
Equal fractions27/30, 36/40, 45/50, 54/60

Fractions over 20 simplified

FractionSimplest formDecimal
1/20already simplest0.05
2/201/100.1
3/20already simplest0.15
4/201/50.2
5/201/40.25
6/203/100.3
7/20already simplest0.35
8/202/50.4
9/20already simplest0.45
10/201/20.5
11/20already simplest0.55
12/203/50.6
13/20already simplest0.65
14/207/100.7
15/203/40.75
16/204/50.8
17/20already simplest0.85
18/209/100.9
19/20already simplest0.95

Frequently asked questions

What is 18/20 in simplest form?

18/20 simplifies to 9/10. Divide the top and bottom by 2, their greatest common factor: 18 ÷ 2 = 9 and 20 ÷ 2 = 10.

What is the greatest common factor of 18 and 20?

The GCF of 18 and 20 is 2 – the biggest number that divides both with nothing left over.

Is 18/20 equal to 9/10?

Yes. Both are 0.9 (90%). 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.