53 x 11 Write 3 as the right most digit in 53 3 5 + 3 = 8. Write that to the left of 3 83 Then write the 5 as the left most digit 583 35 x 11 Write 5 as the right most digit in 35 5 3 + 5 = 8. Write that to the left of 5 85 Then write the 3 as the left most digit 385 57 x 11 Write the 7 in 57 as the leftmost digit 7 5 + 7 = 12 Write the 2 in 12 as the next digit 27 Since our last sum was 10 or greater, we add 1 to the 5 in 57 to get 6 627 91 x 11 Write the 1 in 91 as the leftmost digit 1 9 + 1 = 10 Write the 0 in 10 as the next digit 01 Since our last sum was 10 or greater, we add 1 to the 9 in 91 to get 10 1001