One of my favorite tools to teach addition and subtraction in first grade is a bar model. I started using the part-part-whole diagrams when my district first adopted Envision because I think it really helps my students to visualize what information they have, what they need to find out and therefore, what operation to use. This year, my district's math department is really pushing teachers to use these and I'm excited about that since this is really the best way I've found to teach a sometimes difficult concept.
I've created a very simple Smart activity so that I can introduce using these and model during guided practice. We're starting our first addition and subtraction unit this Monday and I plan on using these often! There are 3 pages in the download - a part-part-whole model and two different comparison models. I included two comparison models because I personally like the one on page 3 better (to me, it makes more sense to have a line as your difference because it shows that you need that amount to get to the bigger part and the oval just looks like a separate part), but the model on page 2 is supposed to be for use in K-2, so I want my students to see it, be familiar with it and know how to use it. I wouldn't want the fact that I used a different model to keep them from showing what they know on a district assessment or confuse them when they got to 2nd grade. Each page has "infinite cloned" counters so that you can model problems as well as a space for a number sentence. Click on the preview below (or here) and download it for free from Teachers Pay Teachers.
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