To find the ratio of the number of orders for pepperoni pizza to cheese pizza, we look at the numbers:
- Pepperoni Pizza orders: 8
- Cheese Pizza orders: 10
The ratio of pepperoni pizza to cheese pizza is:
\[ \text{Ratio} = \frac{\text{Pepperoni Pizza}}{\text{Cheese Pizza}} = \frac{8}{10} \]
This can be simplified by dividing both the numerator and the denominator by 2:
\[ \frac{8}{10} = \frac{4}{5} \]
Thus, the ratio of the number of orders for pepperoni pizza to cheese pizza is 4:5.