Math.U.See Integer Block kitBeing able to see, feel & manipulate a math problem not only helps with understanding but makes math more fun! These blocks are cleverly designed, logical and made from quality materials to last more than one child! Because they click together, your math problem doesn't just fall apart and you can do fun games with them like building a 10 wall! You will need this 133 piece manipulative block set for many levels of Math U See including Primer Delta and