That is 8001. For a number is divisible by 9, the digits must sum up to 9 (or a multiple of 9). So for 8000, the digits sum to 8 [8 + 0 + 0 + 0 = 8]. So you're only 1 away from 9 [8 + 0 + 0 + 1 = 9]
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The smallest number divisible by 3 6 and 9 is 18.
The smallest even number divisible by 6 and 9 is 18.
45/5 = 9 45/9 = 5 Therefore, the smallest number divisible by both numbers is 45.
72
18