575 is the LCM of 23 and 25
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GCD: 5 LCM: 50
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.
Use a multiple chart. 15...15,30,45,60,75,90,105,120,135,150 25...25,50,75,100,125,150,175 10...10,20,30,40,50,60,70,80,90,100,110,120,130,140,150,160 The multiples that are the same are Common Multiples. The one that is the smallest is the lowest common multiples. 150 is the LCM. That is your answer
To find common multiples of two or more numbers, you can list the multiples of each.4, 8, 12, 16, 20, 24, 28, 32, 26, 40, 445, 10, 15, 20, 25, 30, 35, 40, 4520 and 40 are the common multiples that are listed. 20 is the Least Common Multiple (LCM).
The least common multiple of 20 , 25 , 30 = 300