The smallest 3-digit multiple of 7 is 105 = 15*7
The largest 3-digit multiple of 7 is 994 = 142*7
So there are 142-14 = 128 3-digit multiples of 7, ie 128 3-digit numbers that are divisible by 7.
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There are 75 multiples of 12 between 100 and 1000.
630 is divisible by...2 or 3 or 5 or 6 or 7 or 9. your welcome
The 3 digit numbers under 500 are 100 through 499.
999-111=888 888 3 digit numbers can be made with numbers between 1 - 9
There are 3 values (1, 2, 3) for each of the 4 digits. Therefore, there are 3*3*3*3 or 81 four digit numbers that can be formed.