# Lesson 16

Encontremos el valor de expresiones

### Lesson Purpose

The purpose of this lesson is for students to find the value of addition and subtraction expressions in a way that makes sense to them.

### Lesson Narrative

In previous lessons, students interpreted expressions and connected expressions to story problems and drawings. This is the first lesson where students begin by working with only expressions. Because students have matched expressions to drawings in previous lessons, students may create a drawing to find the value of the expression. Students may also use their fingers or objects to represent the expression and count to find the total or difference.

- Action and Expression

- MLR8

### Learning Goals

Teacher Facing

- Find the value of addition and subtraction expressions.

### Student Facing

- Encontremos el valor de expresiones.

### Required Materials

Materials to Gather

Materials to Copy

- Roll and Add Stage 2 Recording Sheet
- Number Mat 1–5

### Required Preparation

Activity 3:

- Gather materials from:
- Roll and Add, Stages 1 and 2
- Shake and Spill, Stages 1-3
- Number Race, Stage 1
- Math Stories, Stages 1 and 2

### Lesson Timeline

Warm-up | 10 min |

Activity 1 | 10 min |

Activity 2 | 10 min |

Activity 3 | 20 min |

Lesson Synthesis | 5 min |

Cool-down | 5 min |

### Teacher Reflection Questions

In a previous unit, students represented numbers in multiple ways, including using their fingers, objects, and drawings. How did students work with representing numbers prepare them to find the value of expressions in this lesson?

### Print Formatted Materials

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Student Task Statements | docx | |

Lesson Cover Page | docx | |

Cool Down | Log In | |

Teacher Guide | Log In | |

Teacher Presentation Materials | docx | |

Blackline Masters | zip |