document.write( "Question 994581: given any number we can multiply the single digits together to end up with another number. we can do the same to the new number and repeat the process again and again until only a single digit number is left. if you start with 123456789, what single digit number do you end up with \n" ); document.write( "

Algebra.Com's Answer #613639 by KMST(5328) $\"\"$ $\"About$

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Since $\"red%282%29%2Ared%285%29=10\"$ ,
\n" ); document.write( "the product of all digits of $\"123456789\"$ will be a multiple of $\"10\"$ :
\n" ); document.write( " $\"1%2Ared%282%29%2A3%2A4%2Ared%285%29%2A6%2A7%2A8%2A9=10%2A%281%2A3%2A4%2A6%2A7%2A8%2A9%29\"$ ,
\n" ); document.write( "so the last digit of that product will be $\"0\"$ ,
\n" ); document.write( "and multiplying all the digits of that product will yield $\"highlight%280%29\"$ . \n" ); document.write( "

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