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3, 6, 9 and so on.

5, 10, 15 and so on.

7, 14, 21 and so on.

Common multiples include, 105, 210, 315 and so on.

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Q: What are the multiples of 3 and 5 and7?

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Since all 3 are prime numbers LCM = 3 * 5 * 7 = 105 All multiples of 105 are multiples of 3, 5 and 7

42,84,126

420

First, we need to fin the LCM of 2, 5, and 7, wich is 70. So that all the multiples of 70 are all common multiples of 2, 5, and 7 such that: 70 x 1 70 x 2 70 x 3 70 x 4 . . .

The Highest Common Factor is 1

There is an infinite number of common multiples for 3 and 7. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).

3,6,9,12,15,18,21,24,27,30,33,36,39,42are multiples of 3 5,10,15,20,25,30,35,40,45,50,55,60,65,are multiples of 5

Their product.

21

210