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.
48
48
The smallest whole number divisible by both 8 and 12 is 24.
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.
The smallest number that is divisible by both 34 and 35 is 1,190.
The smallest number divisible by eight seven and five is 280.
The smallest number that is divisible by 5, 6, and 7 is 210.
The smallest number divisible by 3 6 and 9 is 18.
15 is the smallest number divisible by both 3 and 5