Last week 40 fifth graders went on a field trip to the science museum.
8 fifth graders went to see a live animal presentation.
what fractional part of the group it that?
what percent is that?
the rest if the fifth graders went to the dinosaur exhibit.
what fractional part of the group is that?
what percent is that?

PART ONE:
To put this information into a fraction you write part over whole:
 

To change this into a decimal you have to plug in 8÷40 into your calculator:
0.2

PART TWO:
After you subtract 8 from 40, there are 32 fifth graders left.
The fraction will look like this:


To change this into a decimal you have to plug in 32÷40 into your calculator:
0.8

I hope this was helpful!

The answer is 6 weeks