Answer: 0.4
Step-by-step explanation: In order to write 2/5 as a decimal, we need to find a fraction equivalent to 2/5 with a 10 in the denominator.
Notice that if we multiply both the numerator and denominator by 2, we get the equivalent fraction 4/10 which we can now write as a decimal.
Since 4/10 is equivalent to the decimal 0.4, this means that 2/5 must be equivalent to the decimal 0.4.
