We grew some small watermelons this year. We chose one and measured its circumference each week with some old rick rack. When we were through measuring, we used unifix cubes to measure how much it grew between measurements. We started with green cubes and made a stick the length of the first measurement. Then we moved the green stick over to the second string and added enough yellow cubes to make it the length of that string, and so on.
Here you can see our addition problem.
Then we turned it into a graphing tool.
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