First, to find the simplest form of 90/28, we should find the greatest common factor.
Factors of 90: 1,2,3,5,6,9,10,15,18,30,45,90
Factors of 28: 1,2,4,7,14,28
The greatest common factor of 90 and 28 is 2, so we know that we can divide both top and bottom by 2.
90 divided by 2=45
28 divided by 2=14
The simplest form of 90 and 28 is 45/14.
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28 over 90 in its simplest form is 14 over 45.
83/90 is in its simplest form.
The simplest form for 81 over 90 is 9/10
1 over 90 is already in it's simplest form.
121/90 is already in its simplest form