suma y restas apps by https://padlet.com/carhum_cr/syr La siguiente tiene por objeto la ensenanza de suma y resta con el smartphone en-us 2015-09-12 17:30:30 UTC 2015-09-12 18:09:59 UTC hello@padlet.com https://padlet-assets.storage.googleapis.com/portrait/notebook.jpg Video de suma y resta carhum_cr https://padlet.com/carhum_cr/syr/wish/69855209 2015-09-12 17:44:02 UTC https://padlet.com/carhum_cr/syr/wish/69855209