The same way as proper ones. Find a common denominator, add the converted numerators, simplify if possible.
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The mixed number consists of a whole number and a fraction. Multiply the denominator of the fraction portion by the whole number and to this product add the numerator of the fraction portion. This value is the numerator of the new improper fraction. The denominator of the new improper fraction is the same as the denominator of the original fraction portion of the mixed number.
42/7 is an improper fraction.
1/5 has no improper fraction and 2/5 has no imporper fraction
Changing an improper fraction to a mixed number - simply divide the denominator number into the numerator. For example take the fraction 37/16. 16 divides into 37 twice with 5 remainder. So the proper fraction would be 2 & 5/16.Changing from a mixed number to an improper fraction - multiply the whole number by the denominator, then add the numerator. Using the above example of 2 & 5/16, this would be 16x2 then add 5 to give 37/16.
i think 25/8 Eh, it's 27/8 Take the large three (the whole number in front of the fraction), multiply it by the denominator of the fraction (eight), then add it to the numerator (three). (3*8)+3=27 So, the improper fraction is 27/8