Prior to this lesson, students refreshed their understanding of equivalence. They used it to reason about sums and differences of fractions, the denominators of which are different, that are factors or multiples of one another (2, 4, and 8, and 2, 3, and 6). This lesson extends that work to include fractions with denominators of 10 and 100. Students revisit how to write equivalent fractions in tenths and in hundredths, and then use that understanding to add tenths and hundredths, up to a sum of 1.

Reflect on a time recently when your thinking about students’ understanding or reasoning changed. What led to the change in perspective? How will you alter your teaching practice to incorporate your new understanding?