Exploring Bar Models for Addition and Subtraction

This video tutorial introduces third graders to bar models, a visual tool for solving math problems. It covers the importance of bar models in visualizing and understanding real-world problems, explains different types of bar models such as part-whole and comparison models, and provides strategies for using them effectively. The video also includes examples and practice questions to reinforce learning.

What is the primary purpose of using bar models in math?

• To avoid real-world applications

• To memorize math formulas

• To visualize and solve problems

• To make math problems harder

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CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

If the whole is unknown in a part-whole bar model, what operation should you use?

• Addition

• Subtraction

• Division

• Multiplication

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CCSS.5.NF.A.1

CCSS.5.NF.A.2

Which operation is used when a part is unknown in a part-whole bar model?

• Multiplication

• Division

• Subtraction

• Addition

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CCSS.2.OA.A.1

In a comparison bar model, if you know the difference and one part, how do you find the total?

• Subtraction

• Multiplication

• None of the above

• Addition

What does a comparison bar model typically help to identify?

• None of the above

• Differences between quantities

• Exact values without comparison

• Total amounts only

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CCSS.1.OA.A.1

What is the correct procedure if the whole is unknown in a comparison bar model?

• Multiplication

• Subtraction

• Addition

• None of the above

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CCSS.3.OA.D.8

What keyword indicates the use of an 'adding on' bar model?

• Fewer

• Another

• Less

• Total

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CCSS.2.OA.A.1

In the context of bar models, what does the keyword 'total' usually indicate?

• A subtraction is needed

• A need to find a part

• A known whole amount

• An unknown operation

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CCSS.1.OA.A.1

What should you do first when you encounter a new bar model problem?

• Guess the answer

• Start drawing immediately

• Read and understand the problem

• Ask for help

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CCSS.2.OA.A.1

How many times might you need to read a problem to understand it fully?

• Not necessary to read

• Three times

• Twice

• Once

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CCSS.RF.1.3C

CCSS.RF.2.3D

CCSS.RF.2.3F

CCSS.RF.2.4A

CCSS.RF.3.3A