Putting letters, or words in abc order or numbers in order. Cheap and brilliant! Great for skip counting, fractions, putting different three-digit numbers in order., all great ways to practice grade CCSS
Theme Boxes for the Science Center - I like the flashlight. Light bulb in unplugged lamp. Plug it in, under supervision, to see if it works. Put beaters on a mixer . Need to look around for other authentic tasks,Especially for higher grade levels!