2nd Grade Math 3.5, Relate Addition & Subtraction

Addition and subtraction are related because they undo each other. Related addition and subtraction facts have the same whole and parts. In addition, the parts are the addends and the whole is the sum, and in subtraction the whole amount is the minuend and the parts are the subtrahend and difference. A bar model can help us see the parts and the whole. It can also help us find a missing part. We can use addition facts to remember differences because related facts use the same numbers. We write a related subtraction fact for a given addition fact. We solve two word problems that involve related addition and subtraction facts.

2nd Grade Math 3.1, Use Doubles Facts to Add
https://youtu.be/Vp2nJG9_afg

2nd Grade Math 3.2, Practice Addition Facts to 20, Addition Strategies
https://youtu.be/yNeLy9L5iOk

2nd Grade Math 3.3, Make a Ten to Add
https://youtu.be/GAgzjMiLvvM

2nd Grade Math 3.4, Add 3 Addends
https://youtu.be/o0lt5Bd9wtg

2nd Grade Math playlist:
https://www.youtube.com/playlist?list=PLKi4WTp6PRGUL-MlUdbT5DeAsigMuQc4o

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/

This video and its contents are the property of JoAnn's School and
is protected under U.S. copyright law.

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