5.815 + 6.021 = 11.836. You can use a calculator for that. The calculator will also give you the fraction- 2959/250. Since the whole number at the beginning is 11, that is the number at the start of your mixed number. You times 11 by 250 to get what that part is (this will not be used in your answer) to get 2750. 2959-2750 is 209. This means that the top part of the fraction is 209 and the bottom part is 250. The answer is 8 209/250
