The trend has not been limited to wealthy suburban districts. New York City, Chicago and many other urban districts also are buying large numbers of iPads.The iPads generally cost districts between $500 and $600, depending on what accessories and service plans are purchased.By comparison, Brookfield High in Connecticut estimates it spends at least that much yearly on every student's textbooks, not including graphing calculators, dictionaries and other accessories they can get on the iPads.

They include interactive programs to demonstrate problem-solving in math, scratchpad features for note-taking and bookmarking, the ability to immediately send quizzes and homework to teachers, and the chance to view videos or tutorials on everything from important historical events to learning foreign languages.They're especially popular in special education services, for children with autism spectrum disorders and learning disabilities, and for those who learn best when something is explained with visual images, not just through talking.Some advocates also say the interactive nature of learning on an iPad comes naturally to many of today's students, who've grown up with electronic devices as part of their everyday world.