7/13 can't be converted into an improper fraction, since it's less than 1.
Assume the given value is 7 1/3. This is in mixed number form. To convert it into improper fraction, you need to rewrite the term as the fraction of only numerator and denominator. For the numerator, multiply 7 by 3. Then, add that by 1. You should get:
(7 * 3 + 1) / 3 = 22 / 3
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3 and 1/4 as an improper fraction is 13/4
13/5
Negative 13 can be expressed as an improper fraction as -13/1. This is because the numerator, which is -13, is greater than the denominator, which is 1. In fraction form, this would be read as negative thirteen over one.
To convert the mixed number 4 1/3 to an improper fraction, you multiply the whole number (4) by the denominator of the fraction (3) and add the numerator (1) to get 13. So, 4 1/3 is equivalent to the improper fraction 13/3.
Convert the mixed number to an improper fraction, then do the division. 3 and 1/4 = 13/4 13 divided by 4 = 3.25