document.write( "Question 884981: Hi how can I answer this decimal multiplication?
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Algebra.Com's Answer #534827 by Edwin McCravy(20081)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Estimate (845.7456)x(234.789)x(89.5) by front end rounding\r\n" );
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document.write( "845.7456 is about in the middle between 800 and 900 \r\n" );
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document.write( "234.789 is about in the middle between 200 and 300\r\n" );
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document.write( "So their product is somewhere between 800x300 (or 240000)\r\n" );
document.write( "and 900x200 (or 180000),\r\n" );
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document.write( "So we'll say the product of the first two numbers is \r\n" );
document.write( "about 200000.\r\n" );
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document.write( "Then the third number 89.5 is about 90.\r\n" );
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document.write( "So the answer is about 200000 times 90 or 18000000\r\n" );
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document.write( "[The actual answer using a calculator is 17772172.85,\r\n" );
document.write( "so our ballpark answer is correct to two figures.]\r\n" );
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document.write( "Edwin
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