Descubre el número Scratch
https://scratch.mit.edu/projects/99900890/#fullscreen
https://scratch.mit.edu/projects/99900890/#fullscreen
https://scratch.mit.edu/projects/100495644/#fullscreen
https://scratch.mit.edu/projects/100509422/#fullscreen
https://docs.google.com/presentation/d/15Ox2u2ywm_6sqbuxygdUJ4BqMWTsAF0FTH9KGVLXm98/edit#slide=id.p1
https://docs.google.com/presentation/d/17fh6cWeH703Mm1dbxXwQcgjmIwr7D8V8OwCcSKNxYmU/edit#slide=id.p64
https://docs.google.com/presentation/d/17fh6cWeH703Mm1dbxXwQcgjmIwr7D8V8OwCcSKNxYmU/edit#slide=id.p64
http://serbal.pntic.mec.es/ealg0027/mmundi1e.html
https://www.free-training-tutorial.com/rounding/towncreator/tc-rounding.html