# Lesson 17 Multiply Decimals and Whole Numbers

Let’s multiply whole numbers by tenths and hundredths.

## Warm-up True or False: Place Value Products

Decide if each statement is true or false. Be prepared to explain your reasoning.

## Activity 1 Multiply Decimals By Whole Numbers

## Problem 1

## Problem 2

Find the value of each expression in a way that makes sense to you. Explain or show your reasoning. Use the grids, if needed.

## Activity 2 Using Whole Number Products

## Problem 1

Find the value of each expression. Explain or show your reasoning.

## Problem 2

Kiran wrote this explanation to describe the strategy he used to multiply a whole number by some tenths:

“I just turn the numbers into whole numbers, multiply them, and call them tenths.” (Pause for teacher directions.)

Can you use Kiran’s reasoning to find the value of

Explain your reasoning.

## Practice Problem

## Problem 1

Shade

on the diagram. What is the value of

? Explain or show your reasoning. What is the value of

? Use the diagram if it is helpful.