(13 Oct 21) Lowest common multiple using prime factor trees

Find the Lowest Common Multiple of these pairs of numbers using the factor tree method that we learnt

1. 6 and 15

2. 20 and 30

3. 14 and 42

Find the Lowest Common Multiple of these sets of numbers using the factor tree method that we learnt

1. 29, 26 and 18

2. 20, 28 and 23

3. 30, 9 and 2

4. 24, 30 and 54