Hi, so one batch of the sugar cookie recipe calls for 2 1/3 cups of sugar. SO to make 2 1/2 batches you would have to first multiply 2 1/3 times 2, to get 4 2/3. then split 2 1/3 in half for the other half of the recipe. that would be 1 1/6. then add 1 1/6 plus 4 2/3 to get your answer of <u><em>6 cups of sugar.</em></u>
Multiply 2 1/3 by 2 1/2. The easiest way (?!) is to change both mixed numbers to improper fractions (I dislike that name! It just means a numerator bigger than the denominator).
2 1/3 Multiply the denominator 3 by the whole number 2, add the numerator 1 to get 6+1 = 7. Place that over the denominator, 3. So 2 1/3 = 7/3.
2 1/2 Multiply the denominator 2 by the whole number 2, add the numerator 1 to get 4+1=5. Place that over the denominator, 2. So 2 1/2 = 5/2.
Multiply 7/3 by 5/2.
Finally, convert the improper fractioin 35/6 to a mixed number by dividing 35 by 6 (6 goes into 35 5 whole times with 5 "left over"). The whole number part is 5 and the left over fraction part is 5/6.