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I do a lot of work on the 100s chart to build the +10 and -10 ideas in 2nd grade. Here is a great activity from my friend Joe: http://exit10a.blogspot.com/2016/01/i-like-this-game-because-you-have-to.html
Base ten blocks are always super helpful to with the smaller numbers!
Hope that helps!
I agree. 100s chart and base-ten blocks. You can also use ten frame cards.
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