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.
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1, 3, 199, 597.
Yes because 597/3 = 199
350
To determine the number of odd numbers between 100 and 200, we need to consider that odd numbers are integers that are not divisible by 2. The first odd number in this range is 101, and the last odd number is 199. To find the total count, we can subtract the first odd number from the last odd number and divide by 2, then add 1 to include both endpoints. So, (199 - 101) / 2 + 1 = 50 odd numbers.
198, 199 and 200 if you add them.