Some New 2-Digit Addition Strategies

We’ve been working on adding numbers to 100 WITHOUT regrouping, and students are showing a very good understanding of this skill using a strategy called “vertical addition”.  This is a very traditional strategy that most people use, as seen below.

Vertical Addition

However, the 2Js are also learning some other ways to add (and eventually subtract) 2-digit numbers so they can decide which way works the best for them.  So far we’ve tried adding using a 100 Chart:

100 chartas well as breaking the second addend into 10s and 1s to add them that way.

2nd addend into 10s and 1s

We will learn several more strategies this week.  Although students are encouraged to learn each strategy, they will soon discover the one that works for them and stick with it!

 

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