To multiplying any number of two-digit with number 11
put the total of the two digit between the two digits
ex : 34×11=374
3 + 4 = 7 then output is 374
if the total of the two digit is greater than 9 then we add one to number left and put the single digit of the total between the two number
ex : 67 × 11 = 737
6 + 7 = 13 then we add one to 6 to become 7 then we put single digit of total between the two digits to become 737
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