Because 252 is a multiple of 12, 12 and 252 are one pair (252 = 12 x 21 = 252 x 1)
Another pair is 36 and 84 (252 = 36 x7 and 84 x 3)
252 = 3 x 3 x 4 x 7 = 12 x 3 x 7, so only 36 and 84 are possible multiples of 12.
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20 and 100.GCF is 20, and LCM is 100.
12 and 66
126 and 90 (trial and error gets you the 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.■
4 and 40 8 and 20