Lesson 21 Multiply More Decimals

    • Let’s multiply decimals.

Warm-up Estimation Exploration: Central Park

Central Park is a large park in Manhattan. It is about 3.85 kilometers long and 0.79 km wide. What is the area of Central Park?

Record an estimate that is:

Image of map of Central Park.

too low

about right

too high

Activity 1 Multiply More Decimals

Problem 1

Explain or show why each pair of expressions is equivalent.

  1. and

  2. and

  3. and

Problem 2

Find the value of the products in the previous problem.

Activity 2 Choose Your Strategy

Find the value of each product.

Practice Problem

Problem 1

  1. Explain or show why .

  2. Use this strategy to calculate .