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DOUBLE DIGIT MULTIPLICATION

Current Objective:The learner will be able to multiply 2-digit by 2-digit numbers by explaining the steps necessary
to solve multiplication problems using one of three methods.

Library
A Classroom Lecture
Girl's Softball Team
Teenage Students Raising Hands
Teacher Writing a Formula on a Blackboard
Students Taking Exams
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WHAT IS MULTIPLICATION?

What is it really?
Well, multiplication is:

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REPEATED ADDITION

Multiplication is just repeated addition. If you know how to add, you will be able to multiply. 
Ex: 5x3=5+5+5=15

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GROUPS AND SETS

When we multiply, we are putting things into groups and sets. There are 3 groups of 5 apples. So there are 15 apples in all.

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INVERSE OF DIVISION

Although multiplication is basically repeated addition, multiplication is also the opposite of division. This is because multiplication finds the product by using equal groups. Division is finding how many equal groups we can make out of a certain amount of items.

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HOW TO MULTIPLY

There are several different ways to multiply. We are going to be learning a few of these methods. Click on the "Learn More" buttons under each description to learn more and how to use it.

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LATTICE MODEL

Although it looks very different to the multiplication we are used to, once you start to use it, you'll see how simple it is.

EXPANDED ALGORITHM

Expanded algorithm involves finding each of the partial products. It may look longer to solve, but you can always be sure your answer is correct.

STANDARD ALGORITHM

The quickest form of multiplication. Taking this method step by step and following all the rules guarantees  you will always have your answer.

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