To find the common multiples of two numbers you first have to break them down into their prime factors. In this case, 3 and 10 can be broken down as:
3 = 3
10 = 2x5
The next step would be to identify any common factors, but as there are none, we simply take all these prime factors, and multiply them together:
2x3x5 = 30. If we multiply 30 by any integer it will give a value greater than 40. Thus the only number less than 40 that divides by 3 and 10 is 30.
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Thats easy: 1, 1.25, 1.5, 1.75
Less than.
999,999,999 numbers less than 1,000,000,000.
The natural numbers are the counting numbers. Therefore, the natural numbers less than 31 are the numbers from 1 to 30.
There are, of course, infinitely many numbers in between those two.One of them is their average - simply add the two numbers together, then divide the result by 2.