0.4 as a fraction is 2/5. To convert 0.4 to a fraction, follow these steps:
1. Write 0.4 as 0.4/1.
2. Multiply both the numerator and the denominator by 10 to eliminate the decimal point: (0.4 × 10)/(1 × 10) = 4/10.
3. Simplify the fraction by dividing both the numerator and the denominator by their greatest common divisor (GCD). The GCD of 4 and 10 is 2.
4. Divide both the numerator and the denominator by 2: (4 ÷ 2)/(10 ÷ 2) = 2/5.
So, 0.4 as a fraction is 2/5.