To multiply by a 2-digit number add the two digits and place the sum in between.
29 x 11 = 319 <-- you need to carry the 1 45 x 11 = 495
This is how you multiply 11 with a 3 digit number
253 x 11 = 2783
267 x 11 = 2937
To multiply a two-digit number by 111, add the two digits and if the sum is a single digit, write this digit two times in between the original digits of the number.
23x111= 2553
41x111= 4551
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