To add two fractions, we need to find a common denominator, convert each fraction to an equivalent fraction with that common denominator, and then add the numerators.
Step 1: Identify the Fractions
We are given two fractions to add:
\[
\frac{-5}{8} \quad \text{and} \quad \frac{-1}{25}
\]
Step 2: Find a Common Denominator
To add the fractions, we need a common denominator. The least common multiple (LCM) of 8 and 25 is 200.
Step 3: Convert Fractions to Equivalent Fractions with the Common Denominator
Convert each fraction to an equivalent fraction with the denominator of 200:
\[
\frac{-5}{8} = \frac{-5 \times 25}{8 \times 25} = \frac{-125}{200}
\]
\[
\frac{-1}{25} = \frac{-1 \times 8}{25 \times 8} = \frac{-8}{200}
\]
Step 4: Add the Fractions
Now, add the numerators of the equivalent fractions:
\[
\frac{-125}{200} + \frac{-8}{200} = \frac{-125 - 8}{200} = \frac{-133}{200}
\]