But many of you might still be stumped by this question: Just how many states have adopted the common core? My colleague Catherine Gewertz and I have just provided you an answer by updating our map of which states have adopted (and are using) the standards. It's been a little hard to keep track recently. And even in states that have officially dropped the common core, it's not clear the standards are truly gone. Indiana replaced the common core last year with standards that are quite similar. South Carolina adopted new standards earlier this year that are also closely aligned with the common core.