You live 6 kilometers from your school. how many meters do you live from school?

 6,000 m .  (or, write as:  6,000 meters).
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Explanation:
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Note the exact conversion:  1 km = 1000 m .
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Note:  "km" is an abbreviated form of "kilometer(s)".
              "m" is an abbreviated form of "meter(s)".
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Here is one way to solve, using a method called "dimensional analysis":
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  Given:  6 km ;  convert to  "m"  ; 
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         →  6 km =     ?    m  ;
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        →  6 km *   =   ?    m ;
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        →  On the "left-hand side" of the equation, the units of  "km"                                  "cancel out" to "1" ;  and we are left with:
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        →  6  *    =    ?  m ;
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       .→  6  * 1000 m   =      ?   m  ;
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                            →   =  6,000 m ; or write as:  6,000 meters .
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