Valuable pictorial math materials are

A. blocks.
B. buttons.
C. flash cards.
D. picture books.

c. is my answer.

6 answers

Again, I'd say all of the above. Are flash cards still used extensively? Your answer seems right, but there is evidence that blocks and buttons are effective tools, too.
I have to choose one answer.
I know. If flash cards are used a lot more than the others, go with it!
Most flashcards aren't pictorial.
Neither are blocks or buttons pictorial per se, but give a visual experience. Given the "pictorial" parameter, then the picture book is the obvious answer.
thanks for your help.