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.
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.■
2 and 24 6 and 8
12 and 252
If you have two numbers m and n and their gcd (or gcf), g then their LCM = m*n/g so LCM = 72*252/36 = 2*252 = 504.
20 and 100.GCF is 20, and LCM is 100.
The pair of numbers whose GCF is 1 and LCM is 36 is 9 and 4. The numbers should be greater than their GCF and less than their LCM.
The LCM is 1260. The GCF is 12.
Gcf: 9 lcm: 252
The GCF of 6 and 10 is 2.
12 and 66
18 and 81
12 and 216
3 and 360
11 and 5