We have been studying larger 2-digit numbers. We noticed that every 2-digit number has a place to show the tens hiding inside, along with a place to show the extra ones. We also represented these numbers using ten sticks and circles, and wrote an equation to match our work.
Then we worked on adding two 2-digit numbers together and solved it the same way: by drawing ten sticks and circles.
As first graders, we have become experts at using these symbols to support our thinking. In order to be accurate, we know that our tens and circles have to match our numbers and they must be lined up neatly, with five groups clearly showing, so it’s easy for us to ring a 10.
We have also tried the one ten below strategy:
We even learned the show-all strategy:
Whatever strategy your first grader feels the most comfortable with he or she is welcome to use. Our goal is to be accurate and to understand that sometimes when we add two two-digit numbers together – we make a new ten!!!
Mrs. Stadt :)