Unit 6, Lesson 10
Usemos algoritmos de productos parciales: 2 números de dos dígitos
Grado 4
Preparation
Lesson Narrative
In the previous lesson, students learned to record the partial products from multiplying vertically, using an algorithm. They made connections between the new notation to the structure of the rectangular diagram on which they used earlier. In this lesson, students apply that work to 2 two-digit factors.
Prior to this lesson, students have not needed to compose units when finding the sum of partial products. In the Warm-up, students are invited to compare the recording of composed units in both an addition problem and in the sum of the partial products in a multiplication problem.
- Representation
- MLR8
- Interpret (orally and in writing) an algorithm that uses partial products to multiply 2 two-digit numbers.
- Use an algorithm that uses partial products to multiply 2 two-digit numbers.
- Tratemos de multiplicar números de dos dígitos con un algoritmo en el que se usan productos parciales.
Required Preparation
None
Teacher Reflection Questions
How did understanding the Cool-down of the lesson before you started teaching today help you synthesize that learning?