First you would take 1 2/3 and multiply the 3 times 1 which is 3 plus 2 which makes it 5 now it is 5/3 now do the same for the other one and it is 21/4 now multiply the product of that is 105/12 now as a mixed number it is 8 9/12 because you divide 105 by 12 :) happy to help so the final answer is 8 9/12