What two numbers have the lcm of 10?

Answer 1

This is very simple, all you have to do is get the lowest factor of one number [as long as it's not 1], and give that as one of the "given numbers."
For example, give 9 as a given number, then take a factor of it, which is 3, and give 3 as a given number. So, the given numbers are 3 and 9, and the LCM is 3.
A bit more challenging pair is 2 and 100.

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Answer 2

10 and 25

10:10, 20, 40, 50

25: 25, 50 10 and 25 has 50 as the LCM.

Answer 3

Any consecutive even numbers, like 38 and 40.

Answer 4

30 and 40 have an LCM of 120.

Answer 5

50 and 100, among others.

Answer 6

100 and 200, among others.

Answer 7

5 and 10, among others.

Answer 8

They are: 4 and 25

Answer 9

1 and 2

Answer 10

1 and 2.