DO 9999999×123456 IN SECONDS

        9999999
  ×      123456
_________________
1234559876544


IN SUPPLEMENT TO PREVIOUS POST
WHERE SEVEN TIMES 9 IS MULTIPLIED
BY 7 DIGIT ANY NUMBER.HERE WE ARE
MULTIPLYING 7 TIMES 9 WITH 6DIGIT ANY
NUMBER.
STEPS
1) WRITE 5 DIGIT OF THE 6DIGIT NUMBER AS
    IT IS LIKE 12345 IN THIS EXAMPLE.
2) SUBTRACT 1 FROM 6
    ie 6-1=5
    PUT 5 ALONG WITH 5 NUMBERS
    THUS FIRST PART OF ANSWER IS
    123455
3)NOW SUBTRACT EACH NUMBER
    OF FIRST PART FROM 9 .
    SEVENTH DIGIT  WILL BE
    9.
Explanation
  Write first part of answer as 123455
 Then put 9; thus first part of answer
becomes 1234559
 Then subtract each digit from 9 as
 9-1=8
 9-2=7
 9-3=6
 9-4=5
 9-5=4
 9-5=4

 SECOND PART OF ANSWER = 876544

4) THUS OUR ANSWER IS
     1234559876544