If the same digit can be used more than once: 6 x 6 x 6 = 216 of them.
If each digit can be used only once: 6 x 5 x 4 = 120 of them.
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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.
If you can repeat a digit, there are 27. If you can't repeat a digit, there are only 6.
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.