I use these Math (Freebie) and ELA sheets in our reference folders. We keep ours in the computer lab but they are great in the classroom as well. I added a bunch to these this year, I can't wait to see how much the kids use them!
I just spent the last week coloring them on bright pages and putting them into our lab folders for next year! I print mine in black and white but here is an example of what color looks like as well. I put the Math and the ELA sheets in the same folder!