1. Find LCM of 6,8 using Listing Method

Solution:
Step-1: Lists the first few multiples of `6,8`

Multiples of `6=6,12,18,color{red}{bb{24}},30,36,42,color{red}{bb{48}},54,60,...`

Multiples of `8=8,16,color{red}{bb{24}},32,40,color{red}{bb{48}},56,64,72,80,...`

Step-2: Find common multiples
The numbers that appears in the lists are `color{red}{bb{24,48}},...`

Step-3: Find least common multiple
The first smallest number that appears in the lists is `24`

`:.` LCM of `6,8` is `24`

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2. Find LCM of 4,6 using Listing Method

Solution:
Step-1: Lists the first few multiples of `4,6`

Multiples of `4=4,8,color{red}{bb{12}},16,20,color{red}{bb{24}},28,32,color{red}{bb{36}},40,...`

Multiples of `6=6,color{red}{bb{12}},18,color{red}{bb{24}},30,color{red}{bb{36}},42,48,54,60,...`

Step-2: Find common multiples
The numbers that appears in the lists are `color{red}{bb{12,24,36}},...`

Step-3: Find least common multiple
The first smallest number that appears in the lists is `12`

`:.` LCM of `4,6` is `12`

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3. Find LCM of 10,15 using Listing Method

Solution:
Step-1: Lists the first few multiples of `10,15`

Multiples of `10=10,20,color{red}{bb{30}},40,50,color{red}{bb{60}},70,80,color{red}{bb{90}},100,...`

Multiples of `15=15,color{red}{bb{30}},45,color{red}{bb{60}},75,color{red}{bb{90}},105,120,135,150,...`

Step-2: Find common multiples
The numbers that appears in the lists are `color{red}{bb{30,60,90}},...`

Step-3: Find least common multiple
The first smallest number that appears in the lists is `30`

`:.` LCM of `10,15` is `30`

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4. Find LCM of 15,20 using Listing Method

Solution:
Step-1: Lists the first few multiples of `15,20`

Multiples of `15=15,30,45,color{red}{bb{60}},75,90,105,color{red}{bb{120}},135,150,...`

Multiples of `20=20,40,color{red}{bb{60}},80,100,color{red}{bb{120}},140,160,180,200,...`

Step-2: Find common multiples
The numbers that appears in the lists are `color{red}{bb{60,120}},...`

Step-3: Find least common multiple
The first smallest number that appears in the lists is `60`

`:.` LCM of `15,20` is `60`

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5. Find LCM of 10,15,20 using Listing Method

Solution:
Step-1: Lists the first few multiples of `10,15,20`

Multiples of `10=10,20,30,40,50,color{red}{bb{60}},70,80,90,100,...`

Multiples of `15=15,30,45,color{red}{bb{60}},75,90,105,120,135,150,...`

Multiples of `20=20,40,color{red}{bb{60}},80,100,120,140,160,180,200,...`

Step-2: Find common multiples
The numbers that appears in the lists are `color{red}{bb{60}},...`

Step-3: Find least common multiple
The first smallest number that appears in the lists is `60`

`:.` LCM of `10,15,20` is `60`

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