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make a factor tree for both,

100

50---2

25--2

5--5

LCM = 5*5*2*2

864

24-----36

8---3 6---6

4---2 3--2 3---2

2--2

LCM =2*2*2*2*2*3*3*3

LCM for both 100 and 864 = 5*5*2*2*2*2*2*3*3*3=21600

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13y ago

What else can I help you with?