It is 10/40 = 1/4 in its simplest form
It is: 4/40 = 1/10 simplified.
4/40 = 1/10 in simplest form.
Dividing both by 10, you get 4/5 which is in its simplest form.
-40/90 = -4/9
4/40 simplifies to 1/10 (or .1)
40/150 = 4/15
32/40 = 4/5
40/90 = 4/9
31/40
70/40 simplifies to: 7/4 or 13/4 or 1.75
90/40 simplifies to: 9/4 or 21/4 or 2.25