If a 3-digit number abc is divisible by 11, then ______ is either 0 or multiple of 11.
A number is divisible by 11 if the differences between the sum of
digits at its odd places a
The difference of three-digit number and the number obtained by
putting the digits in reverse order is always divisible by 9 and ___________.
The difference of a two–digit number and the number obtained by
reversing its digits is always divisible by ___________.
The sum of a two–digit number and the number obtained by reversing
the digits is always divisible by __________.