If Morgan has 8 cups of cereal and fills each bowl with 1/2 cup of cereal, we can divide the total amount of cereal by the amount in each bowl to find the number of bowls used:
Number of bowls = Total cereal amount / Amount of cereal per bowl
Total cereal amount = 8 cups
Amount of cereal per bowl = 1/2 cup
Number of bowls = 8 / (1/2)
Number of bowls = 8 * 2
Number of bowls = 16
Therefore, Morgan uses 16 bowls to fill them each with 1/2 cup of cereal from her 8 cups of cereal.