Unit 2, Lesson 9
Relacionemos el área con la multiplicación
Grado 5
Preparation
Lesson Narrative
Students build on their understanding of multiplication and area from IM Grade 3 as they work with areas with fractional side lengths. Students may count the number of smaller parts within a rectangle and will need to recognize and consider the size of these parts, which is a fraction of a square unit. It is important to be precise in the units used to describe the area. Teachers should make sure to refer to “square units” rather than “squares.”
As with the area work in IM Grade 3, the commutative property may be used as a strategy. The commutative property allows students to find products in a way that makes sense to them. For example a student might find the area of a rectangle with side lengths and 4 by thinking of 4 groups of .
In Unit 6, students have another opportunity to interpret the product of a fraction and a whole number in the context of multiplication as scaling. This section is about area.
- Action and Expression
- MLR8
- Explain (orally and in writing) a strategy for determining the area of a rectangle with a whole-number side length and a unit fraction side length.
- Exploremos el área de rectángulos en los que una longitud de lado es una fracción unitaria.
Required Preparation
None
Teacher Reflection Questions
As students shared their ideas today, how did you ensure all students’ voices were heard and valued as an important part of the collective learning?