Flashcards are a classic teaching tool for good reasons. If you want to help your kid master 2D shapes, you can't go wrong with these frugal (not free) printable shapes flashcards PDFs!
According to Brainscape, "Some research has found that this kind of active recall retrieval practice leads to 150% better retention than passive studying."
Tip: You could also use these frugal (not free) shape flashcards to help your child work on colors too, just have your kid name the shape and the color on each card!
Tip: Having your child color or otherwise decorate the shapes flashcards black and white printables may help reinforce the visual representation of each shape!