The number "1⅔" is a mixed number that combines a whole number and a fraction. In this case, it consists of the whole number 1 and the fraction ⅔, which means two parts out of three equal parts. Mixed numbers are often used in everyday situations, such as cooking or measuring, where whole units and parts of units are needed together. To convert "1⅔" into an improper fraction, you multiply the whole number 1 by the denominator 3 of the fraction and then add the numerator 2. This results in 5/3, which represents the same quantity in a different form. Understanding mixed numbers and improper fractions is useful in mathematics and practical applications.