Unit 5, Lesson 25
Divide Decimals by Decimals
Grade 5
Preparation
Lesson Purpose
The purpose of this lesson is for students to divide decimals greater than 1 by decimals less than 1.
Lesson Narrative
In previous lessons, students divided whole numbers by decimals and decimals by whole numbers, with the decimals always less than 1. In this lesson, students apply their understanding of the number of tenths and hundredths in 1 whole to divide a decimal greater than 1 by a decimal. Students use the same strategies that they have in previous lessons to find these quotients:
- Diagrams
- Whole number facts combined with reasoning about place value
- The relationship between multiplication and division
- Representation
- MLR7
- Calculate quotients of a decimal divided by 0.1 or 0.01 and explain (orally and in writing) strategies used.
- Interpret (orally and in writing) diagrams that represent dividing a decimal by 0.1 or 0.01.
- Let’s divide decimals by decimals.
Required Preparation
None
Teacher Reflection Questions
As you finish up this unit, reflect on the norms and activities that have supported each student in learning math. List ways you have seen each student grow as a young mathematician throughout this work. List ways you have seen yourself grow as a teacher. What will you continue to do and what will you improve upon in the next unit?
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