Multiplying 2 numbers close to 100

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Multiplying 2 numbers close to 100

  1. 1. Coffee Math: Methods, Tips And Tricks Series. By Puwork Utara May 2011
  2. 2. Multiplying 2 Numbers Close to 100They are in the base 100.Hence the reference point (base) will be 100.
  3. 3. 88 X 98 = ______ Both numbers are close to 100 but less than 100
  4. 4. 88 X 98 = ______88 +12 10098 +2 100
  5. 5. 88 X 98 = ______88 +12 10098 +2 100Either ( 88 - 2 ) X 100 = 8600Or ( 98 - 12 ) X 100 = 8600
  6. 6. 88 X 98 = ______88 +12 10098 +2 100Either ( 88 - 2 ) X 100 = 8600Or ( 98 - 12 ) X 100 = 8600And 12 X 2 = 24
  7. 7. 88 X 98 = ______88 +12 10098 +2 100Either ( 88 - 2 ) X 100 = 8600Or ( 98 - 12 ) X 100 = 8600And 12 X 2 = 24Last 8600 + 24 = 8624 #
  8. 8. 102 X 104 = ______ Both numbers are close to 100 but more than 100
  9. 9. 102 X 104 = ______102 -2 100104 - 4 100
  10. 10. 102 X 104 = ______102 -2 100104 - 4 100Either ( 102 + 4 ) X 100 = 10600Or ( 104 + 2 ) X 100 = 10600
  11. 11. 102 X 104 = ______102 -2 100104 - 4 100Either ( 102 + 4 ) X 100 = 10600Or ( 104 + 2 ) X 100 = 10600And -2 X -4 = + 08
  12. 12. 102 X 104 = ______102 -2 100104 - 4 100Either ( 102 + 4 ) X 100 = 10600Or ( 104 + 2 ) X 100 = 10600And -2 X -4 = + 08Last 10600 + (+08) = 10608 #
  13. 13. 97 X 102 = ______ One of the numbers is less than 100 and the second number is more than 100
  14. 14. 97 X 102 = ______97 +3 100102 - 2 100
  15. 15. 97 X 102 = ______97 +3 100102 - 2 100Either ( 97 - ( -2)) X 100 = 9900Or ( 104 - 3 ) X 100 = 9900
  16. 16. 97 X 102 = ______97 +3 100102 - 2 100Either ( 97+ 2 ) X 100 = 9900Or ( 104 - 3 ) X 100 = 9900And +3 X (-2 ) = - 06
  17. 17. 97 X 102 = ______97 +3 100102 - 2 100Either ( 97+ 2 ) X 100 = 9900Or ( 104 - 3 ) X 100 = 9900And +3 X (-2 ) = - 06Last 10600 + (- 06 ) = 9894 #
  18. 18. END

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