0.011
91 sets of 9 are there in 819
819 ÷ 9 = 91
1 x 819, 3 x 273, 7 x 117, 9 x 91, 13 x 63, 21 x 39 = 819
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.)
One easy way to check is sum of digits. 819: 8+1+9 = 18. 18 is a multiple of 3. 819 is divisible by 3. 440: 4+4+0 = 8. Not a multiple of 3. 440 is not divisible by 3. 222: 2+2+2 = 6. 6 is a multiple of 3. 222 is divisible by 3.
3, 7, 9, 13, 21, 39, 63, 91, 117, 273.
Yes.
No. 6 is smaller than 57819 so it cannot be divisible by it.
0.011
91 sets of 9 are there in 819
819 ÷ 9 = 91
Yes.
1 x 819, 3 x 273, 7 x 117, 9 x 91, 13 x 63, 21 x 39 = 819
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.
LCD(7,9,13) = 7*9*13 which is 819