Τι είναι τελικά οι διψήφιοι και οι μονοψήφιοι αριθμοί;

https://teachergeorgiasclass.weebly.com/uploads/4/5/0/7/45072177/%CE%9A%CE%B5%CF%86._49_%CE%A0%CF%81%CF%8C%CF%83%CE%B8%CE%B5%CF%83%CE%B7_%CE%BA%CE%B1%CE%B9_%CE%B1%CF%86%CE%B1%CE%AF%CF%81%CE%B5%CF%83%CE%B7_-_%CE%94%CE%B9%CF%88%CE%AE%CF%86%CE%B9%CE%BF%CE%B9_%CE%BA%CE%B1%CE%B9_%CE%BC%CE%BF%CE%BD%CE%BF%CF%88%CE%AE%CF%86%CE%B9%CE%BF%CE%B9_%CE%B1%CF%81%CE%B9%CE%B8%CE%BC%CE%BF%CE%AF.pdf