0.4 as a fraction equals 45/10 or 2/5
Steps to convert 0.4 into a fraction.
Write 0.4 as 0.41
Multiply both the numerator and denominator by 10 for each digit after the decimal point.
0.41=0.4 x 101 x 10=410
As a side note the whole number-integral part is: empty
The decimal part is: .4 = 4/10
Full simple fraction breakdown: 40/100
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