We are LOVING the sumblox, my 3 year old is finding an interest in recognizing numbers and my 6 year old is using them to self discover multiplication and division. I already want to snag another set! These will get so much use with my 3 kiddos and then when I go back to teaching they will come to the classroom with me.
Theres an included guide that shows the versatility of these blocks - how to use the sizes for math equations. As with most open ended toys, the longer you play, the more creative and understanding of intricacies of the pieces come to life. I do imagine these will last a long time for us!