숫자 1의 비밀 111111111 x 111111111 = 12345678987654321? Because 111111111 times 111111111 equals 12345678987654321 according to the laws of multiplication for real numbers. If your question is more along the lines of “Why is there such a nice pattern in this product,” then perhaps I can elaborate a bit further. Note that 111111111 = 100000000 + 10000000 + … + 100 + 10 + 1. As a consequence of the d..