Perkalian Bilangan Bulat dengan Hasil yang Menarik dan Cara Membuatnya

Abstract

In the literature, sometimes, some multipli-cations having interesting results are presented. For instance, 45 12345679 = 555555555 is interesting since all of its digits are 5s. In this paper, some ways to construct such multiplications explained. We will use some results in number theory, such as the characteristics of a number that is divisible by 3 or 9, and the kind of decimal expansion of a fraction having prime deno-minator.