Some numbers are improper fractions and some are not. For example, 1/2 or 0.5 is a number but not an improper fraction. And there is no way in which you can express it as an improper fraction.
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You change them into improper or topheavy fractions.
First you would want to change the mixed number to an improper fraction. Then you can subtract
you have to multiply the top and bottom number by the same number
Change the whole number into an improper fraction with the same denominator as the fraction and then subtract accordingly
This question looks a little turned around. You can't change a proper fraction to an improper one unless you add something to it and improper fractions don't have whole numbers. To change an improper fraction to a mixed number (a whole number with a fraction) divide the denominator into the numerator. The result is the whole number. The remainder gets put over the original denominator. 22/7 = 3 and 1/7