How do you evaluate the following expression using decimals?: 4.56 - 4/5 + 3.21 + 17/32

$4.56 - \frac{4}{5} + 3.21 + \frac{17}{32} = 7.47125$
The best way is to convert each fraction to decimal form. Two of them are already in decimal form. $\frac{4}{5} = \frac{4 \times 2}{5 \times 2} = \frac{8}{10} = 0.8$ and $\frac{17}{32} = \frac{17 \times 3125}{32 \times 3125} = \frac{50125}{100000} = 0.50125$.
Hence, the expression becomes $4.56 - 0.8 + 3.21 + 0.50125 = 7.47125$