Unit 3, Lesson 18
Diagramas y ecuaciones para problemas en palabras
Grado 3
Preparation
Lesson Narrative
In grade 2, students interpreted tape diagrams for one- and two-step problems involving addition and subtraction. Earlier this year, they did the same with one-step word problems involving multiplication. They also learned that a question mark, a blank line, or a box could be used to represent an unknown quantity in an equation.
In this lesson, students connect tape diagrams and equations with a symbol standing for the unknown quantity to two-step word problems. The work of this lesson prepares students to write equations with a letter standing for the unknown quantity and to solve two-step problems, using a diagram if it helps them.
- Engagement
- MLR8
- Match (orally and in writing) two-step word problems, tape diagrams, and equations that represent the same relationships.
- Present (using words and other representations) a strategy for solving a two-step word problem.
- Conectemos diagramas y ecuaciones con situaciones.
Required Materials
Activity 2
Required Preparation
- Create a set of cards from the blackline master for each group of 4 students.
Teacher Reflection Questions
Students previously used tape diagrams to represent and solve one-step addition, subtraction, and multiplication problems. How are they leveraging that knowledge in this lesson on two-step problems?