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You can't. A mixed number is the sum of a whole number and a proper fraction. 253 is a whole number, and if you split it up into a fraction, it would consist of a whole number and an improper fraction.
2 5/7 is a mixed number. another way to look at, as a sum of 2 and 5/7, ends up with the same number. first step is to change the whole part, the 2, into a fraction that also ends up at the same number. 2 is the same as 14/7. so our sum has been changed to 14/7 plus 5/7. Now we can combine the numerators of the fractions that have the same denominator. (14+5)/7. it is now a single fraction 19/7!
To sum up means to give a brief summary (I will sum up the meeting in the email).
Your sum is incorrect. Let me sum up.