This is a set of math manipulatives I created for my daughter. They are commonly used in special education programs. (Popular in the UK, I believe.) For best results, print each number out in a different color (See example.) There are many commercial and freely available activities that can be used with this type of manipulative. Examples include: Commercial examples at: http://www.numicon.com/ Free to download activities at: Oxford University Press https://global.oup.com/education/content/primary/teaching-support/pages/numicon1/?region=international MyBookEzzz.org http://www.mybookezzz.org/numicon-resources-to-print/ Good for use as practice 3D printing objects the parts do not require any structural support. (The base is 5x5 since that is the maximum size for my printer...) **5x5 base now has pegs slightly smaller to allow a bit more "give" to placement of the manipulatives.The base is entirely optional. I recommend, if possible, printing out 2 to 4 sets of the pieces (2 "ones", 2 "twos", etc...), preferrably each number assigned a distinct color.