Highest Common Factor and Lowest Common Multiple

[luigihs]

Highest Common Factor and Lowest Common Multiple of 4 , 6 , 8 , 18


HCF

4 = 2.2
6 = 4.2
8 = 4.2
18 = 2.9

HCF = 2 ?

LCM
4 = 8 , 12 , 16 , 20 , 24 , 28 , 32 ... 72
6 = 12 , 24 , 32 , ... 72
8 = 16 , 24 , 32 ... 72
18 = 36 , 54 , 72

LCM = 72 ??

 

[Mentallic]

Highest Common Factor and Lowest Common Multiple of 4 , 6 , 8 , 18


HCF

4 = 2.2
6 = 4.2
8 = 4.2
18 = 2.9

HCF = 2 ?

Yes the HCF = 2, but what are those other numbers on the right side? 2.2, 4.2?
You should also be able to tell that the HCF is 2 simply because the difference between 4 and 6 or 6 and 8 is 2, and they're even, so logically you should come to that conclusion.

LCM
4 = 8 , 12 , 16 , 20 , 24 , 28 , 32 ... 72
6 = 12 , 24 , 32 , ... 72
8 = 16 , 24 , 32 ... 72
18 = 36 , 54 , 72

LCM = 72 ??

Yes, and notice that 8 is a multiple of 4, and 18 is a multiple of 6, so it would suffice to just find the LCM of 8 and 18.

 

[luigihs]

Thanks :)