This math topic focuses on understanding and writing Roman numerals. It covers basic numeral formation rules and their application in converting contemporary Arabic numbers (like 4, 40, 9, 90, 900, and 400) into their respective Roman numeral equivalents. Each question provides a specific hint about making the composition of Roman numerals, such as combining certain numbers and symbols (e.g., placing a '10' symbol to the left of a '50' symbol to write '40' as 'XL'). The topic teaches the notation system of Roman numerals up to 900.