When in a number the difference between the sum of odd place and even place digits is divisible by 11, then the number is also divisible by 11. 963391← Number Sum of even place digits =6+3+1=10 Sum of odd place digits =9+3+9=21 Difference =21−10=11 11 is divisible by 11. Hence, 963391 is also divisible by 11.