Final answer:
The total pizza Breann and her baby brother ate is 2 and 5/6 pieces.
Step-by-step explanation:
To find out how much total pizza Breann and her baby brother ate, we need to add their individual pizza consumption.
Breann ate 2-½ pieces of pizza, which can be written as a mixed number 2 + 1/2.
And her baby brother ate 1/3 of a piece.
To add these quantities, we need to have a common denominator.
The least common multiple of 2 and 3 is 6.
So, we can rewrite 2 + 1/2 as 2 + 3/6, and 1/3 as 2/6.
Adding these fractions together, we get:
=> 2 + 3/6 + 2/6
= 2 + 5/6.
Therefore, the total pizza they ate is 2 and 5/6 pieces.