This math topic covers the skill of finding the lowest common denominator (LCD) to compare fractions, and determining which denominator would best suit the comparison. The problems involve different pairs of fractions, where students have to select the correct LCD from multiple choices to correctly compare the fractions. It's a basic level exercise where typically only one denominator needs adjusting to find the LCD, which makes it suitable for introductory learning about fraction comparison. This is part of a broader unit on beginning to understand fraction comparison.