DO THE 7×7 MULTIPLICATION IN SECONDS (MAGICAL TRICK OF 9 )

      9 9 9 9 9 9 9
  ×  2 3 4 5 6 7 8
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23456777654322

STEPS
1) SUBTRACT 1 FROM UNITS PLACE NUMBER
     HERE 8
     8-1=7
2) REPEAT THE SAME NUMBER EXCEPT LAST
    DIGIT;PUT 7 INSTEAD OF 8.
3) WE HAVE STARTING PART OF ANSWER
    ie. 2345677.
4) NOW SUBTRACT 1 FROM EACH NUMBER
    STARTING FROM 2
     eg 9-2 =7
           9-3=6
           9-4=5
           9-5=4
           9-6=3
           9-7=2
           9-7=2
5) NOW WE ARE READY WITH SECOND PART OF ANSWER
    ie.7654322
6) FINAL ANSWER
   23456777654322