Perkalian Dengan Angka 9

Perkalian angka 9 dengan semua bilangan hasilnya jika ditambahkan sampai bilangan terkecil hasilnya pasti 9.

Contoh:
9 x 5 = 45 (4+5=9)
9 x 9 = 81 (8+9=9)
9 x 6 = 54 (5+4=9)
9 x 98 = 882 (8+8+2=18  ==>  1+8= 9)

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