



Say
we have one pizza that didn't get sliced. 


If
we wanted to, we could write it as a fraction. 


A
very BORING fraction, 


but
still a fraction. 











If
we had 2 of these unsliced pizzas could we add them together? 


Sure! 











So
5 of these pizzas that weren't sliced would be: 











So
is this supposed to be a big deal or something? 





Well,
not that big. But it does have some use here and there. 


Here
is a way we can use it now. 


Say
we have a 5. 


What
could we multiply it by to get 1? 





That
is: 








Here's
the answer: 











If
you're into fancy math words you'll love this: 











Multiplicative
Inverse just means the number 


that
you multiply
something by to get 1. 





Example: 





What
is the multiplicative Inverse of 12? 











Since: 











So
if we have a fraction we can just flip it over 


and
THAT is the MULTIPLICATIVE
INVERSE. 





And
if we have a whole number, not a fraction, 


we
just write it OVER 1 and MAKE
it a fraction. 





Example: 





What
is the multiplicative inverse of : 











Flip
it over and you get : 








And: 








copyright 2005 Bruce Kirkpatrick 
