Unit 5, Lesson 12
Estimate and Add
Grade 5
Preparation
Lesson Narrative
In a previous lesson, students found decimal sums in a way that made sense to them. In this lesson, students see that the standard algorithm for whole number addition, familiar from a previous course, also works for decimals. Students then estimate sums and find their values. Students are not required to use the standard algorithm, but see how it is an efficient way to add.
Display the Decimal Addition chart from a previous lesson to be used during the Lesson Synthesis.- Representation
None
- Describe (orally and in writing) the steps in a worked example of the standard algorithm for adding decimals to hundredths.
- Use place value strategies to estimate and calculate the sum of decimals to hundredths.
- Let’s add decimals and decide if our answers are reasonable.
Required Preparation
None
Teacher Reflection Questions
What did you say, do, or ask during the Lesson Synthesis that helped students be clear on the learning of the day? How did understanding the Cool-down of the lesson before you started teaching today help you synthesize that learning?