Four-fifths
8/10
8/10 16/20
0.8
Yes the negatives cancel each other out
no
No
the simplest form of four over five is....four over five. You can't reduce that fraction because it already is in simplest form.
four hundreds,five tens,two units for equivalent
no four fifths is one fifth less than five fifths
1
1 7/12 (one and seven-twelfths)
Five quarters