271.11
2,430 is already divisible by 9, and needs no help from another digit.
A number is divisible by 9 if a whole number of 9s can go into it and leave no remainder.
Neither 3 nor 71 are divisible by 9 and nothing will make them so.
NO. 1110 is not divisible by 9. A number is divisible by 9 if the sum of its digits is divisible by 9. 1110 = 1 + 1 + 1 + 0 = 3 (3 is not divisible by 9, thus, 1110 is not divisible by 9.)
8
271.11
1258 isn't divisible by 9. 1251 and 1260 are. The digits of numbers that are divisible by 9 add up to a multiple of 9. If you were to stick a 2 in there somewhere, the result would be divisible by 9.
2,430 is already divisible by 9, and needs no help from another digit.
A number is divisible by 9 if a whole number of 9s can go into it and leave no remainder.
2 or 8
Neither 3 nor 71 are divisible by 9 and nothing will make them so.
It needs an 8.
2440
NO. 1110 is not divisible by 9. A number is divisible by 9 if the sum of its digits is divisible by 9. 1110 = 1 + 1 + 1 + 0 = 3 (3 is not divisible by 9, thus, 1110 is not divisible by 9.)
81: 8 + 1 = 9 which is divisible by 9, so 81 is divisible by 9 162: 1 + 6 + 2 = 9 which is divisible by 9, so 162 is divisible by 9 199: 1 + 9 + 9 = 19 → 1 + 9 = 10 → 1 + 0 = 1 which is not divisible by 9, so 199 is not divisible by 9. 1125: 1 + 1 + 2 + 5 = 9 which is divisible by 9, so 1125 is divisible by 9. So 199 is the only one not divisible by 9.
All numbers divisible by 3 are NOT divisible by 9. As an example, 6, which is divisible by 3, is not divisible by 9. However, all numbers divisible by 9 are also divisible by 3 because 9 is divisible by 3.