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Mathematics 2 digit multiply tip

For those having problem multiply 2 digit x 2 digit mentally, this method may be faster for you:
 
１４×１３：
   （１）１４+３＝１７
   （２）１７×１０＝１７０
   （３）４×３＝１２
   （４）１７０+１２＝１８２
        
   １６×１７：

   （１）１６+７＝２３

    （２）２３×１０＝２３０

    （３）６×７＝４２

    （４）２３０+４２＝２７２

        １９×１９

       （１）１９+９＝２８

       （２）２８×１０＝２８０

       （３）９×９＝８１

       （４）２８０+８１＝３６１


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