1*8+1=9 12*8+2=98 123*8+3=987 1,234*8+4=9,876 12,345*8+5=98,765 123,456*8+6=987,654 1,234,567*8+7=9,876,543 12,345,678*8+8=98,765,432 123,456,789*8+9=987,654,321 9*9+7=88 98*9+6=888 987*9+5=8,888 9,87…