Multiplying Decimals and Models

In this lesson, the teacher explains how to multiply decimals with whole numbers using models. The lesson begins with an introduction to the concept, followed by a detailed example of multiplying 3 by 0.21. The teacher uses different colors to visually represent the multiplication process, making it easier for students to understand. The result is verified using a calculator, and students are given a challenge problem to solve independently, which will be reviewed in a small group session later.

What is the main topic of today's lesson?

• Subtracting decimals with whole numbers

• Dividing decimals with whole numbers

• Multiplying decimals with whole numbers

• Adding decimals with whole numbers

What was the focus of yesterday's lesson?

• Dividing decimals by powers of ten

• Adding decimals by powers of ten

• Multiplying decimals by powers of ten

• Subtracting decimals by powers of ten

What tool is introduced to help multiply decimals with whole numbers?

• A calculator

• A model

• A protractor

• A ruler

In the example problem, what are the numbers being multiplied?

• 21 and 3 hundredths

• 3 and 21 hundredths

• 3 and 21

• 21 and 3

What is the first step in solving the example problem?

• Draw a grid

• Write down the numbers

• Use a calculator

• Pick a color

What color is used to shade the first set of 21 hundredths?

• Blue

• Light pink

• Purple

• Green

How many times is 21 hundredths shaded in the first set?

• Four times

• Three times

• Twice

• Once

What is the significance of shading in the model?

• It represents division

• It represents addition

• It represents multiplication

• It represents subtraction

What color is used to shade the second set of 21 hundredths?

• Light pink

• Yellow

• Green

• Purple

How many total hundredths are shaded after the second set?

• 84

• 42

• 63

• 21