12/28 = 3/7 = 0.428571428
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28/336 = 1/12
To simplify 28 / 35, you divide by the GCF of 28 and 35. The GCF is 7, so 28 / 35 / 7 = 4 / 5.
Unfortunately you can't. 15/28 is the simplest it will go.
By realizing that 28 is half of 56. 28/56 = 1/2
12 / 4 = 3