If learning is a staircase, then all steps are not created equal. In both reading and math, some skills are extraordinarily difficult for students to master. We call these skills Trip Steps because they can cause a stumble in learning. See lists of Trip Steps, which span kindergarten through high school.
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Noteworthy

What Kids Are Reading: 2025 Edition
What are the most popular books at each grade level? Can just 15 minutes of daily reading significantly impact learning outcomes? Get the answers in the world’s largest annual study of K–12 student reading habits.
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