To reduce a fraction to its simplest terms divide top and bottom by their highest common factor.
The highest common factor of 4 and 36 is 4, so divide top and bottom by 4.
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4/9
4/36 = 1/9
8/36 = 4/18 = 2/9
Dividing both sides of the fraction 36/45 by its highest common factor, 9, gives us 36/9 / 45/9 = 4/5, or four fifths.
1/4