Best Answer

The LCM of 2 numbers (x and y) is xy divided by the GCF.

xy = 84*3 = 252.

There are a bunch of factors of 252, so...

252 factors to [2 2 3 3 7]

Give each factor a 3 since GCF=3 is given. You cannot give a two to each or the GCF would be 6. Either one can get the 7.

2*2*3 and 3*7 are the pair (12, 21)

2*2*3*7 and 3 are (84, 3) and also works.■

Q: What are two numbers whose gcf is 3 and LCM is 84?

Write your answer...

Submit

Still have questions?

Continue Learning about Math & Arithmetic

20 and 100.GCF is 20, and LCM is 100.

12 and 66

126 and 90 (trial and error gets you the answer)

The GCF of two numbers multiplied by their LCM will equal the product of the original numbers. If you know the GCF, divide it into the product of the two. The result will be the LCM. If the GCF of two numbers is 1, the LCM is their product.

4 and 40 8 and 20

Related questions

20 and 100.GCF is 20, and LCM is 100.

12 and 66

The GCF of 6 and 10 is 2.

12 and 216

the two smallest numbers are 49 and 14

11 and 5

126 and 90 (trial and error gets you the answer)

The GCF of two numbers multiplied by their LCM will equal the product of the original numbers. If you know the GCF, divide it into the product of the two. The result will be the LCM. If the GCF of two numbers is 1, the LCM is their product.

2 and 30 6 and 10

4 and 40 8 and 20

2 and 24 6 and 8

No, the only way the GCF and LCM of two numbers can be the same is if the numbers are the same.