Answer: 2 5/8
Step by step explanation:
In order to solve this we must divide 21 by 8 to see what is the whole number and the remainder is
21/8 = 2 5/8 (where 2 is a whole number and 5/8 a proper fraction)
A mixed number is a whole number and a proper fraction (remember it is proper if the number on top which is the numerator is smaller than the number at the bottom which is the denominator)