11 multiplied by 8.5

93.5

Step-by-step explanation:

We read the number 8.5 as "8 and 5 tenths". 5/10 is the same as 1/2, so we 11 x 8.5 is then same thing as 11 x 8 1/2 - 8 and a half 11s added together. Adding together 8 11s gets us 88, and half of 11 is (half of 10) + (half of 1) = 5 + 1/2 = 5 1/2, so adding those two together gets us 88 + 5 1/2 = 93 1/2, or 93.5