66/78. Find common factors. They are both divisible by 2,3,6.
Divide both by six.
11/13
That is the simplest form.
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9 over 11.
66/78 = 11/13 = 22/26
4/11
"Percent" means "out of" or "over" 100, so put it over "100" and simplify: 78% = 78/100 = 39/50
66% percent really means 66 over 100. Then, you just have to simplify the fraction 66/100 to get 33/50