Question

What is the best divisibility test for 11

Answer 1

abcdefg is number

Answer 2

now digit at even place are b d and f
sum them up=b+d+f

Answer 3

sum of digit at odd place =a+c+e+g
now difference of these to sum should be zero or divisible by 11

Answer 4

like 121

Answer 5

even place =2

Answer 6

odd place =1+1=2

Answer 7

difference=2-2=0

Answer 8

so it will be divisible by 11