Unit 5, Lesson 19
Usemos propiedades para multiplicar decimales
Grado 5
Preparation
Lesson Purpose
The purpose of this lesson is for students to interpret and find the value of multiplication expressions with decimals and whole numbers.
Lesson Narrative
In previous lessons, students used diagrams and expressions to articulate strategies for multiplying a whole number and a decimal. The purpose of this lesson is to solidify this understanding as they match different expressions for a single product and choose one to find the value. They think strategically about which expression to use. In previous lessons, the strategies included using whole number products and the associative property or using the distributive property. This lesson introduces one more strategy, compensation which is also an example of the distributive property. In the second activity, students choose from these different strategies to find the value of more complex products of a whole number and a decimal.
- Engagement
None
- Calculate products of a whole number and a decimal with 2 non-zero digits and explain (orally and in writing) strategies used.
- Match decimal multiplication expressions that have equivalent values and justify (orally) the matches.
- Interpretemos y encontremos el valor de expresiones de multiplicación que tienen números decimales y enteros.
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?
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