Are your students having trouble with breaking composing and decomposing tens and ones. Well these folding cards are just what you are looking for. 11-99 are represented with these amazing and simple cards.
Cut on the solid black line
Fold on the two dotted lines
Lay it flat to show the expanded form
Fold it to show the standard form, so that the plus sign folds over the “0” and the ones digit is now next to the tens digit.