Question

Without dividing, select and write down the number which are divisible by 3. (81, 102, 164, 189, 352, 372, 466, 756, 951, 1029 )

Answer 1

81
102
189
372
756
951
1029

the sum of the digits of the numbers are divisible by 3

Answer 2

sum of the digits are divisible by 3 then that number is divisible by 3

81 , sum of the digits = 8+1 = 9 is divisible by 3
therefore 81 is divisible by 3
same way 102 ,189,372,756,951,and 1029 are divisible by 3