# Lesson 7 Build Multiplication Fluency

Let’s multiply multi-digit whole numbers using the standard algorithm.

## Warm-up Notice and Wonder: Same Solution

What do you notice? What do you wonder?

## Activity 1 Greatest Product

Directions:

Partner A chooses a number card and writes the number in one of the blanks for Round 1.

Partner B does the same.

Repeat until each partner has a two-digit by three-digit multiplication problem.

Find the product.

The partner with the greater product wins a point.

The partner with the most points after 5 rounds wins the game.

## Activity 2 Desperately Seeking 9 New Units

## Problem 1

Tyler notices that when he uses the standard algorithm and composes a new unit, sometimes there is 1 new unit, sometimes 2, all the way up to 8. He has not seen an example with 9 of the new unit.

For each of these products, how many of each new unit do you compose?

## Problem 2

Do you think it is possible to compose 9 of a new unit with the standard multiplication algorithm?

## Practice Problem

## Problem 1

Andre is playing Greatest Product. He says the greatest product it’s possible to make in the game is