1. The problem is to convert the mixed number $1 \frac{2}{5}$ to a decimal. 2. Recall that the mixed number consists of a whole part and a fractional part: $1$ plus $\frac{2}{5}$. 3. Convert the fraction $\frac{2}{5}$ to decimal by dividing numerator by denominator: $2 \div 5 = 0.4$. 4. Add the decimal fraction to the whole number: $1 + 0.4 = 1.4$. 5. Therefore, the decimal equivalent of $1 \frac{2}{5}$ is $1.4$.