Unit 3, Lesson 17
Sums of Tenths and Hundredths
Grade 4
Preparation
Lesson Purpose
The purpose of this lesson is for students to use equivalent fractions to add tenths and hundredths, when the sum is greater than 1.
Lesson Narrative
Prior to this lesson, students learned to combine tenths and hundredths up to a sum of 1. In this lesson, they extend that work to include greater fractions and continue to build their ability to identify equivalent fractions that are helpful for finding sums.
They also encounter some equations involving unknown addends. While subtracting tenths and hundredths is not an expectation at this point, students can reason about the unknown addends by relying on their understanding of addition, their experience with decomposing a fraction into a sum, and their knowledge of equivalence.
- Engagement
- MLR8
- Explain (orally) strategies for determining the number that makes an equation with tenths and hundredths true.
- Justify (orally) that an addition expression with tenths and hundreds is greater than, less than, or equal to 1.
- Let’s add more tenths and hundredths.
Required Materials
Activity 1
Required Preparation
Activity 1
- Create a set of cards from the blackline master for each group of 2–4 students.
Activity 3
- Create a set of cards from the blackline master for each group of 2 students.
Teacher Reflection Questions
What questions that you asked supported students’ thinking about equivalence and addition of fractions today? What did students say or do that showed they were effective?
Have a correction or suggestion?
Tell us about a typo, a broken link, or an improvement you’d like to see. We read every submission but can’t reply.
Have a question or need support instead? Visit our Contact Us page to reach our team.