Divide a number by 11. If the quotient is a whole number, it's a multiple.
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Between 1 and 100, multiples of 11 are double numbers: 11, 22, 33 and so on. After that, a lot of the three-digit multiples of 11 are where the middle number is the sum of the outer two. 132, 286, 374, etc.
The same way as finding factors of positive numbers but the answer includes both the positive and negative factors.
The way you find a multiple of a number is by looking at all the number that equal it. ex. 6: 6,12,18,24,30,36,42,48 and more on multiples never stop but greatest common factors do.
The multiple of both 3 and 4 are numbers that are divisible by both 3 and 4 evenly. There are infinitely many. A simple way to find them is list multiples of 4 (as high as you please) and then every third one is also divisible by 3. For example: 4, 8, 12, 16, 20, 24, 28, 32, 36...4n. The numbers 12, 24, 36 are each divisible by both 3 and 4.
10 is a multiple of 10. 20, 30, 40, 50 and so on are multiples of 10.