I really don't know I tried to look this question up but I could not find it sorry guys
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When you put 60 over 48, they have a 12 in common. After taking out this 12, you are left with 5 over 4. Since 5 and 4 have nothing in common, that is as far as you can go.
60/80 simplifies to 3/4
660/11 = 60/1 => 60 simplified
12 / 4 = 3
1 over 3