Ziploc Bag Slider Number Line for Addition & Subtraction

I recently saw this idea on Mrs. T’s First Grade Class and thought it was awesome! It’s got so many applications in math, I can hardly stand it! Id’s be great for simple addition/subtraction (draw a number line from 0 up). I wish I had known about this idea when I was teaching kids about negative numbers (write 0 in the middle along with positive and negative numbers)!

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