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To find the LCM of two numbers, you first split them into their prime factors:

30 = 2x3x5

75 = 3x5x5

Next you need to work out the HCF. Here, the HCF will be 3x5 = 15.

Finally, you multiply the numbers together and divide by the HCF. 30x75/15 = 150. Therefore the LCM of 30 and 75 is 150.

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โˆ™ 2012-02-26 16:41:13
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Q: What are the lcm of 30 and 75?
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