2nd Grade Math 3.4, Add 3 Addends

We can add 3 addends by adding two addends first, then adding the third addend to that sum. It's helpful if two addends will make a ten first. Addition problems can be written as a number sentence, or in vertical form, up-and-down. The sum will be the same. We can add in any order to get the same sum. We can solve addition problems in different ways by adding in different orders. If we get the same sum by adding different ways, our sum is probably correct. Remember to add all of the addends. An unknown addend is a missing addend. We can find an unknown addend by adding 2 of the addends first, then find the missing addend by figuring out how many more we need to equal the sum. We solve two word problems that involve adding three addends.
2nd Grade Math 3.1, Use Doubles Facts to Add
   • 2nd Grade Math 3.1, Use Doubles Facts...  

2nd Grade Math 3.2, Practice Addition Facts to 20, Addition Strategies
   • 2nd Grade Math 3.2, Practice Addition...  

2nd Grade Math 3.3, Make a Ten to Add
   • 2nd Grade Math 3.3, Make a Ten to Add  

2nd Grade Math playlist:
   • 2nd Grade Math Course  

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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