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Q: What are the 2 pairs of numbers whose LCM is the product of the numbers?

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10 and 28

1, 2 and 3

To find the LCM, you multiply the numbers together and then divide by the HCF. In this case, we don't know the numbers, but we have the HCF (13) and we have the product of the numbers (1690). Thus all you do is divide 1690 by 13 to get: 1690/13 = 130 And thus the LCM of two numbers whose hcf is 13 and product is 1690 is 130.

The LCM of two numbers is sometimes the product of the two numbers.

By finding out whether they have any factors in common. If the only factor they have in common is 1, the LCM will be their product. If they have more factors in common, their LCM will be less than their product.

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4 and 9 11 and 12

4 and 9 7 and 8

4 and 8, 8 and 12

They are 2 and 140 because their LCM is 140 and their product is 280

30 and 3

4 and 6 6 and 8 Any time the two numbers have a common factor, their LCM will be less than the product because the common factor contributes to the LCM fewer times than it contributes to the product.

Sometimes.

10 and 28

They are: 2 and 140

The LCM of 4 and 6 is 12.

1, 2 and 3

When the numbers are co-prime, ie have no common factor. Simplest example is 2 & 3 whose LCM is 6

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