Again, there are heaps of these out there, but here’s my take on them. Printable on an A4 piece of paper. Don’t shrink to fit as they should measure exactly the right size squares when you print at 100% scale. I’ve made 4 versions, coloured and b&w so you can cut out coloured paper if you like and stick it on. I laminated mine too.
You can download the 4 versions of free PDF here:
pink tower flash cards numbers
pink tower flash cards numbers-pink
pink tower numbers written-pink
And the 4 examples of it are here:
can't have enough montessori stuff 