Hi!  Up for sale today is this preowned set of Discovery Toys Think It Through books as well as a set of heavy plastic trays with removable number and letter tiles.  The tile boards may not be Discovery Toys and are not part of the books.  Books are in good condition with typical shelf wear, intact bindings, may not be complete set.  Book topics include beginning reading, measurement, time, money. counting, addition, subtraction, vocabulary and more!  The 4 large tile boards are solid plastic with a gridwork for putting number and letter tiles on them to spell words and practice counting.  Tiles and boards show scuffing and scratching, there is a mixture of tiles that have handwritten letters and numbers on them as well as factory-printed numbers and letters on tiles.  Not a complete set and does not have original box or instructions.  One tile board has crack and is somewhat flexible due to that.  Tile boards measure 12.5" x 6.25" x 3/4" thick.  Text tiles for the boards measure 1.5" square.  Once again, the books are in decent condition but do not have tiles.  The tile boards seen are for a different brand but still educational and great for the classroom!  Thanks for looking!!!