0.4 as a Fraction

0.4 as a fraction is 2/5.

How to convert 0.4 to a fraction

  1. 0.4 has one decimal place, so write it over 10 (a 1 followed by 1 zero) with the decimal point removed: 0.4 = 4/10.
  2. Find the greatest common divisor of 4 and 10: it is 2.
  3. Divide both by 2: 4 ÷ 2 = 2 and 10 ÷ 2 = 5.
  4. The answer is 2/5.

Check

Divide the numerator by the denominator: 2 ÷ 5 = 0.4. As a percent, 0.4 = 40%.

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See also: 2/5 as a decimal.

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