Modeling 2 Digit by 2 Digit Multiplication

Introduction

Mathematicians! In this module we are going to take the strategies we used to multiply single digit factors by multi digit factors to move into multiplying double digit factors by 2 digit factors. Not much changes in how we use the strategy, but we need to make sure we think of what happens to a unit when we multiply that unit by a ten. For example, when we multiply a one times a ten or 1 x 10 our product will be a ten. What about when we multiply a one times a hundred? You are right - we get a hundred! But what happens when we multiply a ten times a ten? Well let's think of a base ten block! The area of a base ten block that is ten by ten is 100. SO, a ten times a ten or 10 x 10 is going to give us a hundred! Keep this in mind as you move through this module.

Guided Practice

Stop and Jot

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Independent Practice: Discussion Post

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How is using the area model in order to multiply whole numbers by single digits similar or different to multiplying whole numbers with double digits? Make sure to use mathematics vocabulary to help explain your response.

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