# Lesson 14

Medidas de peso y de capacidad

### Lesson Purpose

The purpose of this lesson is for students to apply their understanding of multiplicative comparison and unit conversion to solve multi-step problems about weight and capacity.

### Lesson Narrative

In earlier lessons, students were introduced to several units of weight and capacity (kilograms, grams, pounds, ounces, liters, and milliliters). In this lesson, students solve problems involving the units of capacity they worked with in grade 3. They use their knowledge of unit conversion and multiplicative reasoning to solve multi-step problems. Students may need to review the measurement units used in this lesson before the lesson to ensure access to the tasks.

• Representation
• MLR8

### Learning Goals

Teacher Facing

• Use multiplicative comparison and unit conversion to solve multi-step problems about weight and capacity (in pounds, ounces, gallons, quarts, and cups).

### Student Facing

• Resolvamos problemas sobre peso y capacidad.

### Required Materials

Materials to Gather

### Required Preparation

Activity 1:

• Gather a one-gallon jug (with or without milk), a one-quart container, and a one-cup container for display during the launch.
• On chart paper, create the table in the activity with an extra column for showing the amounts of lassi in cups, to be displayed during synthesis.

### Lesson Timeline

 Warm-up 10 min Activity 1 20 min Activity 2 15 min Lesson Synthesis 10 min Cool-down 5 min

### Teacher Reflection Questions

The multi-step problems in this lesson require students to carefully make sense of both textual and mathematical information. How did students manage the language demands of those problems? Which types of problems seem to be particularly challenging? What supports or modifications might be needed?

### Suggested Centers

• Can You Draw It? (1–5), Stage 4: Area and Perimeter (Supporting)
• Rectangle Rumble (3–5), Stage 3: Factors 1–10 (Supporting)