A mixed number is a whole number and a proper fraction. Mixed numbers or mixed fractions are used to express an amount greater than a whole but less than the next whole number. Mixed numbers can be formed from improper fractions. They're useful in describing units that cannot be equally divided.
Fractions and mixed numbers
Fractions by themselves are often easy to understand. Whole numbers are easy. When fractions and whole numbers get together, though, the mixed numbers can be much more challenging to understand.
You are probably familiar with fractions, which are usually parts of a whole and always existing (in proper form) between the whole numbers 0 and 1: