Forget the zero.
3.6 = 3 and 6/10
-------------------------improper fraction
(10*3+6)/10
= 36/10
-----------
7.9 = 7 and 9/10
-------------------------improper fraction
(10*7+9)/10
= 79/10
--------------------so,
79/10 - 36/10
= 43/10
=========in an improper fraction (4.30 as decimal, or 4.3)
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fraction of 120 out of 360 = 120/360 or 1/3
fraction of 360 if you have 60 = 60/360 or 1/6
This is a fraction 1/4
It is: 90/360 = 1/4 of a turn of 360 degrees
48/360 or reduced to 2/15