10 and 15 15 and 20 20 and 25
the common multiples of 20 and 25 is 100 (through 100)
The first five multiples of 5 are 5, 10, 15, 20 and 25. For them to be common, they need to be compared to another set of multiples.
The least common multiple of 20 and 25 is 100.
The first four multiples of five: 5, 10, 15, 20
100 is the least common multiple of 20 and 25.
The common multiples of 15 and 25 are all multiples of their LCM, which is 75. So, the common multiples are 75, 150, 225, 300, 375, 450, 525, 600, and so on.
75
Multiples of 5 include 5, 10, 15 and 20. For them to be common, they need to be compared to another set of multiples.
Common multiples of 15 and 25 are all multiples of 75. That is because 75 is the least common multiple of 15 and 25. So they are 75, 150, 225, etc. Just keep multiplying 75 by 4,5,6...etc.
100.
The LCM is 100