# Lesson 17

Multipliquemos decimales y números enteros

### Lesson Purpose

The purpose of this lesson is for students to multiply a whole number by any amount of tenths or hundredths.

### Lesson Narrative

In previous lessons students made sense of decimals to the thousandth and added and subtracted decimals to the hundredth. The goal of this lesson is for students to multiply decimals to the hundredth in a way that makes sense to them. They apply their work with decimal place value and multiplication of whole numbers. Students may draw pictures (hundredths grids or tape diagrams) or reason using place value or properties of operations (distributive and associative). As with addition and subtraction of decimals, students see that for multiplication, they can use what they know about whole number multiplication as long as they pay close attention to place value.

• Action and Expression

### Learning Goals

Teacher Facing

• Multiply a whole number by tenths and hundredths in a way that makes sense to them.

### Student Facing

• Multipliquemos números enteros por décimas y centésimas.

### Required Materials

Materials to Copy

• Small Grids

Building Towards

### Lesson Timeline

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

### Teacher Reflection Questions

If you were to teach this lesson again what would you do the same? What would you change?

### Suggested Centers

• Target Numbers (1–5), Stage 8: Add Tenths or Hundredths (Addressing)
• Target Numbers (1–5), Stage 9: Subtract Tenths or Hundredths (Addressing)