The GCF of 78 and 130 is 26.
78/26 = 3
130/26 = 5
78/130 = 3/5
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39/45 = (3*13)/(3*15) = 13/15
40% = 0.40 = 40/100 = 2/5 in its simplest form
The GCF of 42 and 45 is 3. 42/3 = 14 45/3 = 15 42/45 = 14/15
Well, honey, 28 over 27 is already in its simplest form. It's not like that fraction is going to the gym to work out and get any simpler. So just leave it be and let it live its best fraction life.
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