>>11945746When multiplying 11 by any whole two digit number, the first digit of the two digit number becomes the first digit of the solution, the second digit of the two digit number becomes the last digit of the solution, and the sum of the two digits in the two digit number becomes the central digit in the solution. If that sum is itself a two digit number, you carry the ten to the appropriate digit in the solution. For example:
11 x 23 = 2 (2+3) 3 = 2 (5) 3 = 253
11 x 17 = 1 (1+7) 7 = 1 (8) 9 = 187
11 x 59 = 5 (5+9) 9 = 5 (14) 9 = 649
