어떻게 이루워 지는가? 1 x 8 + 1= 9 12 x 8 + 2= 98 123 x 8 + 3= 987 1234 x 8 + 4= 9876 12345 x 8 + 5= 98765 123456 x 8 + 6= 987654 1234567 x 8 + 7= 9876543 12345678 x 8 + 8= 98765432 123456789 x 8 + 9= 987654321 1 x 9 + 2 = 11 12 x 9 + 3 = 111 123 x 9 + 4 = 1111 1234 x 9 + 5 = 11111 12345 x 9 + 6 = 111111 123456 x 9 + 7 = 1111111 1234567 x 9 + 8 = 11111111 12345678 x 9 ..