Find the GCF of the numerator and the denominator and divide them both by it. The GCF of 7 and 28 is 7, 7/28 becomes 1/4
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To simplify 6/7 + 5/4, you need to find a common denominator. The least common multiple of 7 and 4 is 28. Changing the fractions to have a denominator of 28 gives you 24/28 + 35/28. Adding these fractions gives you a final answer of 59/28.
To simplify 28 / 35, you divide by the GCF of 28 and 35. The GCF is 7, so 28 / 35 / 7 = 4 / 5.
12/28 = 3/7 = 0.428571428
17/28, 9/14, 19/28
28/80 = 7/20