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The factors of 15 are 1, 3, 5, and 15 .The factors of 75 are 1, 3, 5, 15, 25, and 75 .The common factors ... numbers that are factorsof both 15 and 75 ... are 1, 3, 5, and 15 .
The number in common is 5, because it divides both 5 and 15.
The number 5 is common to both 15 and 100.
The greatest common multiple of 7 and 15, like any two numbers, is infinite.The lowest common multiple, the smallest number into which both 7 and 15 divide, is 105The greatest common factor, the largest number which divides both 7 and 15, is 1.
The LCF, or Lowest Common Factor, of 3 and 5 is 15. This is because 15 is the smallest number that both 3 and 5 can divide into evenly. In other words, 15 is the smallest multiple that is common to both 3 and 5.