The number "1 4/5" is a mixed number, which combines a whole number and a fraction. In this case, it consists of the whole number 1 and the fraction 4/5. This means that it represents one whole unit plus four-fifths of another unit. To convert "1 4/5" into an improper fraction, you multiply the whole number by the denominator of the fraction and then add the numerator. This results in 9/5, which is another way to express the same value. Mixed numbers are often used in everyday situations, such as cooking or measuring.