what is the LCM of 14, 21, 28 i got 28 is ti correct?

Question

amistre64 · Answer

lets see, 21 times what is 28?

anonymous · Answer

it can't

amistre64 · Answer

14 = 7*2
21 = 7*3
28 = 7*2*2

then lets split these into prime factors and see what we can make


14 = 7*2
21 = 7*3
28 = 7*2*2


14 needs a 2 and a 3;  21 needs a 2 and a 2; and 28 needs a 3 such that

LCM = 2*2*3*7  most likely

amistre64 · Answer

the double 2 might be a bit much ... its been a while since i tried thinking of these

anonymous · Answer

this what i did:

i just listed the multiples and found the least one which was 28

amistre64 · Answer

LCM = 2*3*7  = 42 ; and 28 doesnt multiply to get 42 ... looks like we would need it

42*2 = 84, not 28

amistre64 · Answer

14: 28,42,56,70,84

21: 42, 63, 84

28: 56, 84

amistre64 · Answer

the smallest multiple they have in common is 84