First multiply the total amount of pizzas sold by the amount of slices in each pizza. ( It would also help if you converted the fraction into a decimal; 1/2=.5 )
Length = 99 because... since you multiply to get the area, in order to find the missing term of an area (in this case its length), you do the opposite of what you started with...so if you multiplied to get the area, you need to divide to get the missing side... so 8811 divided by 89 = 99 99 x 89 = 8811
