Lets practice with a 2 digit number first:

1. for example lets take 23
2. Adds the two digit together example for number 23 is 2+3 = 5
3. Insert the number between the original number, example 2 5 3, and there you have your answer

Ok now what if the number has total adds up to more than ten like for 89

1. Just adds the two digits ex: 8+9=17
2. Now insert between the first and the last of the original number with the number 1 being add to the previous number ex: 8(+1) 7 9 resulting 979 and there’s your answer.

Now for the ultimate, how to multiply number that has more than 2 digit with 11, for example 239:

1. First split the number ex: 2+3 = 5 and 3+9 = 12
2. Now remember,since the last number has value that more than 10, adds the 1 to the first number ex: 5(+1) 2 resulting 6 and 2
3. Insert it between the first and last of the original number ex: 2 6 2 9 and there you have it.

Now a bonus example of a 4 digits number, lets take 8752:

1. Split the numbers 8+7=15; 7+5=12; 5+2=7
2. Adds any number with more than ten to the previous number ex: 15(+1) 2 7 or 16 2 7
3. Insert it between the first and last number 8(+1) 6 2 7 2 resulting in 9 6 2 7 2.

And that’s conclude our tutorial, just keep practicing and you’ll be a master of 11 multiplier.