Question

what least number must be added to 1054, so that the sum is completely divisible by 3

Answer 1

2 must be added to 1054 to make a complete divisible by 3

Answer 2

for any number to be divisible by 3

the sum of its digit be divisible by 3

so 1+0+5+4=10 which is not divisible by 3

now we take no. 1056

1+0+5+6=12

so 12 is divisible by 3

so 1056 is divisible by 3

it means 2 is added to 1054 to get 1056