Sat, 09/23/2023 - 09:39 Tech Insider Piedmont Elementary School math teacher Cassie Holbrooks helps a small group of fourth-grade students with a three-digit subtraction problem in Piedmont, Alabama, on Aug. 31, 2023.Trisha Powell Crain/AL.com via AP Tags Education, Math, Education, test-scores, us-education-system, Alabama, STEM, associated-press, insider-news Source One rural Alabama school district figured out how to improve students' math sco…