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LCM is used when there are two or more numbers and you need to find the smallest number they will all divide evenly into. For example: 2, 3, and 5.

The multiples of 2 are 2, 4, 6, 8, 10...28, 30

The multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, 27, 30

The multiples of 5 are 5, 10, 15, 20, 25, 30

The smallest multiple that they have in common is 30, so it is the LCM.

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11y ago
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12y ago

To find out what multiple two numbers have in common.

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12y ago

The LCM will help you add and subtract fractions. The GCF will help you simplify fractions.

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Q: Why LCM is required?
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