Unit 3, Lesson 17
Sumas de décimos y centésimos
Grado 4
Preparation
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.
- Sumemos más décimos y centésimos.
Required Materials
Activity 1
Required Preparation
- Create a set of cards from the blackline master for each group of 2-4 students.
- 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?