To find the part of the pizza that was not eaten, you need to subtract the parts that Randal and Griffin ate from the whole pizza (which is represented as 1).
Randal ate \( \frac{3}{8} \) of the pizza and Griffin ate \( 0.5 \) (which can be converted to a fraction as \( \frac{1}{2} \)).
First, let's express \( \frac{1}{2} \) in terms of eighths to make the subtraction easier.
\[ \frac{1}{2} = \frac{4}{8} \]
Now we can add the parts they ate together:
\[ \text{Total eaten} = \frac{3}{8} + \frac{4}{8} = \frac{7}{8} \]
Now, to find the part that was not eaten:
\[ \text{Part not eaten} = 1 - \text{Total eaten} = 1 - \frac{7}{8} \]
To subtract \( \frac{7}{8} \) from 1, we can express 1 as \( \frac{8}{8} \):
\[ \text{Part not eaten} = \frac{8}{8} - \frac{7}{8} = \frac{1}{8} \]
Therefore, the part of the pizza that was not eaten is \( \frac{1}{8} \).
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