0.4 as a Fraction
0.4 = 2/5
0.4 as a fraction in simplest form is 2/5.
Step by step
- 0.4 has 1 decimal place, so write it over 10: 4/10.
- Find the greatest common divisor of 4 and 10: 2.
- Divide the top and bottom by 2: 4 ÷ 2 = 2, 10 ÷ 2 = 5.
- So 0.4 = 2/5.
Details
- Fraction
- 2/5
- Percent
- 40%
- Nearest 1/16 (tape measure)
- 3/8
- Reciprocal
- 5/2 ≈ 2.5
How it works
To turn a decimal into a fraction, count the digits after the decimal point, write the digits over 10, 100, 1,000 and so on, then simplify by dividing the numerator and denominator by their greatest common divisor. A decimal that ends (terminates) always converts to an exact fraction; a decimal that repeats forever, such as 0.333…, equals a fraction like 1/3.
Nearby values
Related conversions
Frequently asked questions
What is 0.4 as a fraction?
0.4 is 2/5 in simplest form.
How do you convert 0.4 to a fraction?
Write 0.4 as 4/10, then divide the top and bottom by 2 to get 2/5.
What is 0.4 as a percentage?
0.4 × 100 = 40%.
Is 2/5 in simplest form?
Yes — 2 and 5 have no common factor other than 1.