Final answer:
Sarah will need 4 cups of sugar to make six batches of cookies, by multiplying 2/3 cup needed for one batch by six.
Step-by-step explanation:
To calculate the total amount of sugar Sarah needs for six batches of cookies, we need to multiply the amount of sugar used for a single batch by the number of batches she plans to make. The problem states that each batch calls for 2/3 cup of sugar.
So, the calculation would be:
2/3 cup/batch × 6 batches = 4 cups of sugar
Therefore, Sarah will need 4 cups of sugar to make six batches of cookies.