Answer
0.8, 0.8015, $\frac{21}{25}$, $\frac{7}{8}$
Work Step by Step
$\frac{7}{8}$, 0.8, $\frac{21}{25}$, 0.8015
= $\frac{7}{8}$, $\frac{8}{10}$, $\frac{21}{25}$, $\frac{8015}{10000}$
= $\frac{875}{1000}$, $\frac{8}{10}$, $\frac{84}{100}$, $\frac{8015}{10000}$
= 0.875, 0.8, 0.84, 0.8015
It is easier to compare decimals if they are all tenths, or all hundredths,
and so on. Because 7.8015 has four decimal places (ten-thousandths), write zeros to the right of 0.875, 0.8 and 0.84 so they also have four decimal places.
= 0.8750, 0.8000, 0.8400, 0.8015
Now, Least to greatest order is :
0.8000, 0.8015, 0.8400, 0.8750
So, 7.005, 7.5, 7.5005, 7.505
0.8, 0.8015, $\frac{21}{25}$, $\frac{7}{8}$
