find the LCM by common multiples.
a) 12 and 15
b) 15 and 20
c) 9 and 27
d) 6,12 and 18
e) 13, 26 and 39
f) 11,22 and 33
2. find the LCM using prime factorisation
a) 4,6 and 9
b) 10 and 24
c) 30,60 and 15
d) 42 and 56
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