Answer:
It is a way to represent a fraction by a set of common denominators: 1/10, 1/100... The advantage of decimals is that because all of them are in common denominators already, addition, subtraction and comparing are quite straightforward. To convert decimal to fraction is very simple, 3.14=314/100.
Step-by-step explanation:
She rode the roller-coaster 8 times and the dodgems 5 times.
I’m pretty sure it would be 30

and surely you know how much that is.