Any multiple of 420.
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The GCF is 3.
Because 3 is the largest number that divides into both 12 and 15 evenly with no remainder.
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12,24,36,48,60,72,84.....The multiples of 12 are12:12,24,36,48,60,72,84,96,108,120,132,and 144
Oh, dude, the Least Common Multiple (LCM) of 3, 12, and 15 is like the smallest multiple that all three numbers can divide evenly into. So, you look at the multiples of each number and find the smallest one they all share, which in this case is 60. So, the LCM of 3, 12, and 15 is 60. Easy peasy lemon squeezy.