Teachers, do NOT use DeltaMath. I can already feel the pain from doing this, and trust me, this isn't good in the slightest. This math software genuinely makes me want to end it all due to its horrible system of determining whether or not the answer is correct, even though I did the calculations and it somehow marked it as wrong without further explanation. And for the assignments in the math class I take, there's only one problem per question, so you can't even try again if you get it wrong even though each "written" question only gives you 2 attempts to get it correct. There's also sometimes no video or examples, and in rare cases, they don't even have both. So if you don't have that for the assignment, then good luck figuring the problem out... I'm very sure you'll get it wrong anyways. I genuinely hope my Integrated Math teacher sees this review and starts using Kami or IXL more than whatever this abomination of a "learning site" this is.