California Assessment of Student Performance and Progress (CAASPP) Math Practice Exam

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What is the least common multiple (LCM) of 4 and 5?

  1. 10

  2. 15

  3. 20

  4. 25

The correct answer is: 20

To determine the least common multiple (LCM) of 4 and 5, we look for the smallest positive integer that is a multiple of both numbers. The multiples of 4 are: 4, 8, 12, 16, 20, 24, and so on. The multiples of 5 are: 5, 10, 15, 20, 25, and so on. The smallest multiple that appears in both lists is 20. Therefore, the LCM of 4 and 5 is 20. Identifying the least common multiple is helpful in various mathematical applications, particularly in problems involving fractions and finding common denominators. In this case, 20 recognizes both numbers' scaling in a way that allows for effective calculation and combination in further mathematical contexts.

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