Question

How to find LCM and HCF of 5,15,90

Answer 1

factors of 5 =5
factors of ,15 is =3,5
factors of 90=2,3,5,6,9 etc
in here the only common nu8mber is 5 therefore it is the highest common factor hcf = 5
the prime factorisation of 5= 5
and for 15 =3*5
for 90=2,3,3,5
Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the lcm:

=5*3*3
=45