Here are 12 Addition and Subtraction problems with an Earth Day theme. They are mostly 2 digit numbers, with a couple of 3 digit numbers. These were designed with second graders in mind, but could be used for first graders who need a challenge, as well as third graders who need to practice solving story problems.
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I have taught for over thirty years, and have taught most grades from preschool through eight grade. Most of my experience is in the primary grades. I presently teach second grade.