4.5 as a Fraction

4.5 as a fraction is 9/2. As a mixed number that is 4 1/2.

How to convert 4.5 to a fraction

  1. 4.5 has one decimal place, so write it over 10 (a 1 followed by 1 zero) with the decimal point removed: 4.5 = 45/10.
  2. Find the greatest common divisor of 45 and 10: it is 5.
  3. Divide both by 5: 45 ÷ 5 = 9 and 10 ÷ 5 = 2.
  4. The answer is 9/2.

Since 9 is larger than 2, you can also write it as the mixed number 4 1/2: 9 ÷ 2 = 4 remainder 1.

Check

Divide the numerator by the denominator: 9 ÷ 2 = 4.5. As a percent, 4.5 = 450%.

Similar decimals

DecimalFraction
4.343/10
4.3587/20
4.37535/8
4.422/5
4.4589/20
4.623/5
4.62537/8
4.6593/20

See also: 9/2 as a mixed number.

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