Numberblocks One to Twenty are ready to help children learn early counting and number sequencing skills. Start by building a 5-piece puzzle featuring Numberblocks One to Five and gradually progress to building a 20-piece puzzle featuring Numberblocks One to Twenty. Introduce early math skills such as counting and number sequencing with your children''s favorite Numberblocks One through Ten characters! Colorful, self-correcting puzzles are the perfect way to introduce counting and number sequencing. Each set includes 5 double-sided, self-correcting puzzles featuring Numberblocks One through Twenty. As your little one works from preschool to kindergarten, the Numberblocks Sequencing Puzzle Set is a great way to make learning fun and help with the transition. From the friendly TV series Numberblocks, an award-winning show from BBC, the Numberblocks crew brings math learning to life with the Numberblocks Sequencing Puzzle Set! Numberblocks is helping millions of children around the world to fall in love with numbers, master key math skills and discover the joy of learning.