The Libs got spanked over "Outcome-Based Education" 20 years ago so this is their stealth way of implementing it anyway. They can't give Fs ... notice the lowest grade for completing the work (correct or not) listed by rondog was a 7 out of 10 ...
Liberals LIKE having the general public think things are "too difficult" for them to understand personally ... it makes it easier for the libs to pass crap where the math doesn't work by saying "trust us, we have PhDs". OTOH, with such impressive intellectual specimens for parents, Common Core might be the only way Sasha and Malia can get an A in Math ...