4th Grade Math 1.8, Word Problem Solving, Comparison Problems with Addition & Subtraction

We can use the strategy draw a diagram, to solve comparison word problems, that involve addition or subtraction. A comparison problem compares one amount to another amount. Our diagram can be a bar model. A bar model helps us see how information is related. We are comparing two quantities. In a bar model, the two boxes represent the quantities being compared. The bracket represents the difference. We can check our answer by using estimates to see if our answer is reasonable. We can also check our answer by using an inverse operation. We show three examples of solving word problems using bar models for comparison, and a multi-step word problem involving a table of information.

4th Grade Math 1.4, Round Numbers to a Certain Place-value
https://youtu.be/DaiMFwbArZE

4th Grade Math 1.5, Rename Numbers, Combine Place Values
https://youtu.be/19X12LcRits

4th Grade Math 1.6, Add Whole Numbers with Regrouping, Renaming
https://youtu.be/BdNVPPSRNeE

4th Grade Math 1.7, Subtract Whole Numbers with Regrouping, Renaming
https://youtu.be/xWN5YCt9cNc

4th Grade Math Playlist (2015)
https://www.youtube.com/playlist?list=PLKi4WTp6PRGX7RhcxctRibNb7V091JZfn

I'm using the Houghton Mifflin Go Math!
2015 copyright textbook for this playlist.

You can practice online using the textbook's website
https://www.gomathacademy.com/

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