Which book to buy to learn all these?

[rosekidcute]

LCM of

Numbers
Fractions
Rational expressions

GCF of

Numbers
Fractions
Rational expressions

 

[tkhunny]

Why not any Pre-Algebra book?

Personally, though, there is SO MUCH online, doe it have to be a book? I might start with http://www.purplemath.com/

TONS of material on every conceivable subject - not just those you requested, but so much after that, too.

 

[rosekidcute]

Thanks
I found this from a pdf online .

LCM
1.
Find the prime factorization of each
number in the group.
2.
Make a list of ALL factors, raised
to the HIGHEST power that appears in
any factorization.
3.
Multiply out.

GCF

1.
Find the prime factorization of each
number in the group.
2.
Make a list of COMMON factors,
raised to the LOWEST power that
appears in any factorization.
3.
Multiply out