100 / 8 = 12.5. Rounding this up gives you 13, therefore 13 x 8 is the first multiple of 8 (i.e., number divisible by 8) in the desired range. After that, simply add 8 at a time to get additional multiples.
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There are 49 numbers between 1 and 100 that are divisible by two.
Since 100/4 = 25, there are 25 numbers between 0 and 100 divisible by 4.
33 numbers between 1 and 100 are divisible by 3.
To find the numbers between 1 and 100 inclusive that are divisible by either 9 or 4, we first determine how many numbers are divisible by 9 and how many are divisible by 4. There are 11 numbers divisible by 9 (9, 18, 27, ..., 99) and 25 numbers divisible by 4 (4, 8, 12, ..., 100). However, we must be careful not to double-count numbers divisible by both 9 and 4 (36, 72). Therefore, the total number of numbers divisible by 9 or 4 between 1 and 100 inclusive is 11 + 25 - 2 = 34.
14 of them.