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Coffee Math:
     Methods,
     Tips And Tricks
     Series.

                       By
                       Puwork Utara
                       May 2011
Multiplying
     2 Numbers
    Close to 100
They are in the base 100.
Hence the reference point
   (base) will be 100.
88   X   98 = ______




         Both numbers
         are close to 100
         but less than 100
88   X   98 = ______

88         +12    100
98         +2
                  100
88       X   98 = ______

88              +12            100
98              +2
                               100

Either       ( 88 -   2    )   X   100 = 8600
Or           ( 98 -   12   )   X   100 = 8600
88       X   98 = ______

88              +12             100
98              +2
                                100

Either       ( 88 -    2    )   X   100 = 8600
Or           ( 98 -    12   )   X   100 = 8600

And           12   X   2 = 24
88       X   98 = ______

88              +12             100
98              +2
                                100

Either       ( 88 -    2    )   X   100 = 8600
Or           ( 98 -    12   )   X   100 = 8600

And           12   X   2 = 24

Last     8600 + 24 = 8624              #
102 X 104 = ______




     Both numbers
     are close to 100
     but more than 100
102 X 104 = ______

102    -2     100
104   - 4
              100
102 X 104 = ______

102         -2             100
104         - 4
                           100

Either   ( 102 +   4   )   X   100 = 10600
Or       ( 104 +   2   )   X   100 = 10600
102 X 104 = ______

102         -2              100
104         - 4
                            100

Either   ( 102 +    4   )   X   100 = 10600
Or       ( 104 +    2   )   X   100 = 10600

And        -2   X   -4 = + 08
102 X 104 = ______

102          -2              100
104          - 4
                             100

Either    ( 102 +    4   )   X   100 = 10600
Or        ( 104 +    2   )   X   100 = 10600

And         -2   X   -4 = + 08

Last     10600 + (+08) = 10608          #
97   X   102 = ______




         One of the numbers
         is less than 100 and
         the second number
         is more than 100
97    X   102 = ______

97         +3     100
102        - 2
                  100
97       X   102 = ______

97            +3            100
102           - 2
                            100

Either   (   97 - ( -2)) X 100      = 9900
Or       ( 104 -    3   )   X   100 = 9900
97       X   102 = ______

97            +3               100
102           - 2
                               100

Either   (   97+      2    )   X   100 = 9900
Or       ( 104 -       3   )   X   100 = 9900

And          +3   X   (-2 ) = - 06
97       X    102 = ______

97             +3               100
102            - 2
                                100

Either    (   97+      2    )   X   100 = 9900
Or        ( 104 -       3   )   X   100 = 9900

And           +3   X   (-2 ) = - 06

Last     10600 + (- 06 ) = 9894             #
END

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Multiplying 2 numbers close to 100

  • 1. Coffee Math: Methods, Tips And Tricks Series. By Puwork Utara May 2011
  • 2. Multiplying 2 Numbers Close to 100 They are in the base 100. Hence the reference point (base) will be 100.
  • 3. 88 X 98 = ______ Both numbers are close to 100 but less than 100
  • 4. 88 X 98 = ______ 88 +12 100 98 +2 100
  • 5. 88 X 98 = ______ 88 +12 100 98 +2 100 Either ( 88 - 2 ) X 100 = 8600 Or ( 98 - 12 ) X 100 = 8600
  • 6. 88 X 98 = ______ 88 +12 100 98 +2 100 Either ( 88 - 2 ) X 100 = 8600 Or ( 98 - 12 ) X 100 = 8600 And 12 X 2 = 24
  • 7. 88 X 98 = ______ 88 +12 100 98 +2 100 Either ( 88 - 2 ) X 100 = 8600 Or ( 98 - 12 ) X 100 = 8600 And 12 X 2 = 24 Last 8600 + 24 = 8624 #
  • 8. 102 X 104 = ______ Both numbers are close to 100 but more than 100
  • 9. 102 X 104 = ______ 102 -2 100 104 - 4 100
  • 10. 102 X 104 = ______ 102 -2 100 104 - 4 100 Either ( 102 + 4 ) X 100 = 10600 Or ( 104 + 2 ) X 100 = 10600
  • 11. 102 X 104 = ______ 102 -2 100 104 - 4 100 Either ( 102 + 4 ) X 100 = 10600 Or ( 104 + 2 ) X 100 = 10600 And -2 X -4 = + 08
  • 12. 102 X 104 = ______ 102 -2 100 104 - 4 100 Either ( 102 + 4 ) X 100 = 10600 Or ( 104 + 2 ) X 100 = 10600 And -2 X -4 = + 08 Last 10600 + (+08) = 10608 #
  • 13. 97 X 102 = ______ One of the numbers is less than 100 and the second number is more than 100
  • 14. 97 X 102 = ______ 97 +3 100 102 - 2 100
  • 15. 97 X 102 = ______ 97 +3 100 102 - 2 100 Either ( 97 - ( -2)) X 100 = 9900 Or ( 104 - 3 ) X 100 = 9900
  • 16. 97 X 102 = ______ 97 +3 100 102 - 2 100 Either ( 97+ 2 ) X 100 = 9900 Or ( 104 - 3 ) X 100 = 9900 And +3 X (-2 ) = - 06
  • 17. 97 X 102 = ______ 97 +3 100 102 - 2 100 Either ( 97+ 2 ) X 100 = 9900 Or ( 104 - 3 ) X 100 = 9900 And +3 X (-2 ) = - 06 Last 10600 + (- 06 ) = 9894 #
  • 18. END