To arrange the fractions \( \frac{3}{4}, \frac{3}{8}, \frac{1}{2}, \frac{1}{8}, \frac{4}{5} \) in descending order, we can either convert them to decimals or find a common denominator.
Let's convert each fraction to a decimal:
- \( \frac{3}{4} = 0.75 \)
- \( \frac{3}{8} = 0.375 \)
- \( \frac{1}{2} = 0.5 \)
- \( \frac{1}{8} = 0.125 \)
- \( \frac{4}{5} = 0.8 \)
Now, we can compare the decimal values:
- \( 0.8 \) (which is \( \frac{4}{5} \))
- \( 0.75 \) (which is \( \frac{3}{4} \))
- \( 0.5 \) (which is \( \frac{1}{2} \))
- \( 0.375 \) (which is \( \frac{3}{8} \))
- \( 0.125 \) (which is \( \frac{1}{8} \))
Now, we can write them in descending order:
\[ \frac{4}{5}, \frac{3}{4}, \frac{1}{2}, \frac{3}{8}, \frac{1}{8} \]
So, the fractions in descending order are:
\(\frac{4}{5}, \frac{3}{4}, \frac{1}{2}, \frac{3}{8}, \frac{1}{8}\).