Mental calculation technique Website
Mental calculation technique
Example Mental calculation Reason 398*41600-8=1592 398*4=(400-2)*4 =400*4-2*4 =1600-8 240*5120*10divide by 2 and multiply by 10 240*5=240*10/2 =(240/2)*10 =120*10 320/56
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added by drkannanphd on 2007-04-04 09:18:50