Lesson 20 Products in the Hundredths Place

- Let’s multiply tenths by tenths.

Warm-up What Do You Know About …?

What do you know about these expressions?

$1 \times 0.1$
$0.1 \times 0.1$

Activity 1 Products of Tenths

Problem 1

Find the value of each expression. Explain or show your reasoning. Use the grids if they are helpful.

$2 \times 0.3$
$0.2 \times 0.3$

Problem 2

Kiran says $0.2 \times 0.4 = 0.8$ . Do you agree with Kiran? Explain or show your reasoning.

Activity 2 Multiply Tenths

Problem 1

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

$1.8 \times 0.4$
$2.5 \times 0.6$
$3.8 \times 0.7$

Problem 2

How are these products the same? How are they different?

$74 \times 6$
$7.4 \times 6$
$7.4 \times 0.6$

Practice Problem

Problem 1

Shade the diagram to represent $0.7 \times 0.4$ .
What is the value of $0.7 \times 0.4$ ?