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I use my husband and kids as guinea pigs. That’s what I was doing one evening during dinner when I handed everyone a post-it note. I was practicing a lesson I was planning on teaching the next day to a group of fifth graders. “Write down five numbers from 1 to 47 on your post-it. You can use your favorite numbers or simply choose random ones. It doesn’t matter. If you match any of the five I write down, I’ll…