That's known as the least common multiple, or LCM.
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It stands for Least Common Multiple. If something is asking for the LCM of numbers it's asking for the lowest number that is a multiple of both or all of the numbers.
Two pairs of numbers with 105 as their least common multiple are (15, 105) and (21, 105). This means that both pairs of numbers are multiples of 105 and their only common multiple is 105. The least common multiple is the smallest number that both numbers can divide evenly into.
The Least Common Multiple (or Lowest Common Multiple) of a group of numbers, called the LCM, is the smallest number that's a multiple of all the numbers. For instance, the LCM of 16 and 20 is 80; 80 is the smallest number that's both a multiple of 16 and a multiple of 20.
The least common multiple (LCM) of two numbers is the smallest multiple that is divisible by both numbers. In this case, the LCM of 7 and 11 is simply the product of the two numbers since they are prime numbers and have no common factors other than 1. Therefore, the LCM of 7 and 11 is 7 x 11 = 77.
Oh, dude, the least common multiple of 4 and 12 is like the smallest number that both 4 and 12 can divide evenly into. So, basically, it's the smallest number where these two numbers can hang out and party together without any leftovers. In this case, the least common multiple of 4 and 12 is 12, because 12 is the smallest number that both 4 and 12 can divide into without any remainders.