1.8 as a Fraction

1.8 as a fraction is 9/5. As a mixed number that is 1 4/5.

How to convert 1.8 to a fraction

  1. 1.8 has one decimal place, so write it over 10 (a 1 followed by 1 zero) with the decimal point removed: 1.8 = 18/10.
  2. Find the greatest common divisor of 18 and 10: it is 2.
  3. Divide both by 2: 18 ÷ 2 = 9 and 10 ÷ 2 = 5.
  4. The answer is 9/5.

Since 9 is larger than 5, you can also write it as the mixed number 1 4/5: 9 ÷ 5 = 1 remainder 4.

Check

Divide the numerator by the denominator: 9 ÷ 5 = 1.8. As a percent, 1.8 = 180%.

Similar decimals

DecimalFraction
1.68/5
1.62513/8
1.6533/20
1.717/10
1.757/4
1.87515/8
1.919/10
2.01201/100

See also: 9/5 as a mixed number.

Another decimal? Use the decimal to fraction converter or browse the decimal to fraction chart.