What do we call the bottom number of a fraction?

The bottom number of a fraction is called the denominator. The denominator serves a crucial function in the fraction, as it indicates how many equal parts the whole is divided into. For example, in the fraction 3/4, 4 is the denominator, which tells us that the whole is divided into four equal parts. This terminology is fundamental in understanding fractions, as it helps define the relationship between the numerator, which is the top number representing how many of those parts are being considered, and the whole represented by the denominator. Understanding this distinction is essential for working with fractions in mathematics.