1)  23501 = 5 (mod 11)  therefore you can add 6 to make it divisible by 11.

Check: 23507 / 11 = 2137 



2)  13636 = 7 (mod 11)  



Give it some thought.  Remember, you're subtracting for this problem.   

As a hint: 7 is the remainder, what remainder do you need if 11 is to exactly divide the new number?  







 

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