"Buy the hand2mind Numberblocks® Simple Cut Adding & Subtracting Puzzle Set at Michaels. com. Explore the relationship between Numberblocks one through ten by adding or subtracting to find a new Numberblock friend. These two piece, self-correcting puzzles perfectly illustrate the power of Number Magic! From the friendly TV series Numberblocks, an award winning show from BBC, the Numberblocks crew brings math learning to life with this officially licensed adding and subtracting puzzle set...