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What number goes in to 15 and 100?
The number 5 is common to both 15 and 100.
What is the smallest number that is a common multiple of 3 and 5?
15
What is the LCF of 3 and 5?
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.
What is the least common denominator of 5 and 15?
The least common denominator of any two integers is 1. To see this, convert the integers to fractions so they actually have denominators. 5 = 5/1 15 = 15/1 The denominators are both 1, so they are already common. 1 cannot be reduced, so they are already least. So, the LCD of 5 and 15 is 1. You may have intended to ask about the least common multiple, which makes more sense for integers. For this, list the multiples of each number, and find the lowest number in both lists. 5 = 5, 10, 15, 20, 25 15 = 15, 30, 45, 60, 75 The lowest number in both lists is 15, and so 15 is the lowest common multiple (LCM) of 5 and 15.
What are the common factors of 40 and 15?
One way to determine the common factors is to find all the factors of the numbers and compare them. The factors of 15 are 1, 3, 5, and 15. The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40. The common factors are 1 and 5. The greatest common factor is 5.
