McGraw-Hill is a household name and it has set several apps to FREE to celebrate Digital Learning Day! We picked the best to showcase here that help elementary students with math, grammar and American history. All subjects that kids happily study and never, ever argue about doing for homework in a land called "Not My House". Grammar Wonderland, Everyday Mathematics, and American History Timeline are some of the good stuff to be had for free right now. Hurry up and download though, these slashed prices will only last until February 12!