Question

The product of 11,111,111 into 11,111,111 is 12,345,678,987,654,321 . HOW ?​

Answer 1

It's like a pattern:

1*1=1

11*11=121

111*111=12321

1111*1111=1234321

11111*11111=123454321

And so on....

Hope it helps:)