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The prime factors of each number are
1 : 1 (technically 1 is not a Prime number)
2 : 2
3 : 3
4 : 2²
5 : 5
6 : 2, 3
The Lowest Common Multiple is the product of the highest power of each prime factor.
This gives 1 × 2² × 3 × 5 = 60....which is the smallest whole number divisible by 1 to 6.
48
16
The smallest number that is divisible by 20 and 15 is 60.
112
The smallest number that is divisible by 18 and 48 is 144.