Laminate a number ladder, cut small slits in top & bottom & add a pipe-cleaner with a small bead. Use the bead to slide up & down as you complete addition & subtraction problems (",). could do the same thing with a horizontal number line.
Fractions Decimals and Percents puzzles! - If you put it on a clear plastic square, the picture on the back will be complete. (I guess I would need 2 pieces of plastic for each puzzle, solve on one side sandwich with second piece, and flip!