Common Core State Standards has a huge focus on nonfiction text, but there isn't always a matching passage that supports core curriculum foci. This passage is meant to compliment, or provide an introduction, to comparing fractions with different denominators.
CCSS.Math.Content.4.NF.A.2
Compare two fractions with different numerators and different denominators, e.g., by creating common denominators or numerators, or by comparing to a benchmark fraction such as 1/2.
CCSS.Math.Content.3.NF.A.3.