Medieval Times brought up a discussion of times before that and the Roman Empire. Some children said they had noticed the Roman Numerals on clocks and in other places and were curious to learn about them. Wanting to take advantage of that curiosity, we worked on learning the symbols and then used them to work on addition and subtraction facts. It certainly added a challenge and another level off complexity but it did help some children when they saw that 15 was written XV because it was 10 and 5. Some kids even took on the challenge of writing four digit numerals with Roman Numerals. We found an online game at ABC ya to help practice the skill.