2 7/9 = 25/9
Multiply the denominator 9 times the whole number 2, which gives you 18. Add the 18 to the numerator 7 to get 25. This is the new numerator. The denominator stays the same, which is 9.
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7/5 is already an improper fraction.
57/7
Seven fifths as a mixed number is 12/5. As an improper fraction: 7/5
20/7 = 2 and 6/7. 20/7 is an improper fraction.
Seven fourths ((1x4)+3)/4