Unit 1, Lesson 14
Escribamos y resolvamos ecuaciones con números desconocidos
Grado 3
Preparation
Lesson Purpose
The purpose of this lesson is for students to relate equations to and write equations for multiplication situations and diagrams using a symbol for the unknown number.
Lesson Narrative
Students have worked with addition and subtraction equations with a symbol to represent the unknown number in grades 1 and 2. Students build on that work and the work with multiplication equations in the previous lesson as they encounter multiplication equations that have a symbol for the unknown number for the first time.
- Representation
- MLR8
- Explain (orally) strategies for finding an unknown factor or product.
- Match (orally) multiplication equations with a symbol for an unknown product or factor with situations and diagrams.
- Represent a multiplication situation or diagram using an equation with a symbol for the unknown product or factor.
Required Preparation
Activity 1
- Create a set of cards from the blackline master for each group of 2.
Teacher Reflection Questions
How do tape diagrams help students make sense of equations in which the unknown number is in different positions?
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