Teacher Crystal Kirch, center, talks to her students in her pre-
calculus class at Segerstrom High School in Santa Ana, Calif.,
Jan. 16. / Jae C. Hong, AP SANTA ANA, Calif. (AP) - When Timmy
Nguyen comes to his pre-calculus class, he's already learned the
day's lesson - he watched it on a short online video prepared by
his teacher for homework. So without a lecture to listen to, he
and his classmates at Segerstrom Fundamental High School spend
class time doing practice problems in small groups, taking
quizzes, explaining the concept to other students, reciting
equation formulas in a loud chorus, and making their own videos
while teacher Crystal Kirch buzzes from desk to desk to help
pupils who are having trouble. It's a technology-driven teaching
method known as "flipped learning" because it flips the time-
honored model of classroom lecture and exercises for homework -
the lecture becomes homework and class time is for practice. "It
was hard to get used to," said Nguyen, an 11th-grader. "I was
like 'why do I h