How to write a mathematical diary about the unit of length?

How to write a mathematical diary about the unit of length?


Last week, we studied fractions. Fractions have numerator, denominator and fraction line. For example, 1 / 3, 3 is denominator, 1 is numerator, and the middle horizontal is fraction line. Fractions are used in many places in life. For example, a book has 30 pages, and each page is 1 / 30 of a book