Question

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

Answer 1

lets see, 21 times what is 28?

Answer 2

it can't

Answer 3

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

Answer 4

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

Answer 5

this what i did:

i just listed the multiples and found the least one which was 28

Answer 6

LCM = 2*3*7 = 42 ; and 28 doesnt multiply to get 42 ... looks like we would need it

42*2 = 84, not 28

Answer 7

14: 28,42,56,70,84

21: 42, 63, 84

28: 56, 84

Answer 8

the smallest multiple they have in common is 84