Find the least number that is divisible by 12, 18, 21, and 30
$$12=2\times 2\times 3$$
$$18=2\times 3\times 3$$
$$21 =3\times 7$$
$$30 =2\times 3\times 5$$
Select the common terms
LCM = $$2\times 2\times 3\times 3\times 5\times 7$$
= 1260
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