document.write( "Question 561275: what is the answer ti 7/15 + 5/12? \n" ); document.write( "

Algebra.Com's Answer #364227 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+7%2F15+%2B+5%2F12+\"$
\n" ); document.write( "The only factor that is common to both $\"+12+\"$ and $\"15+\"$
\n" ); document.write( "is $\"+3+\"$ , since $\"+3%2A4+=+12+\"$ and $\"+3%2A5+=+15+\"$
\n" ); document.write( "I'll try $\"+12%2A15+\"$ for an LCD, but I'll divide it by the
\n" ); document.write( "common factor of $\"+3+\"$ .
\n" ); document.write( " $\"+%28+12%2A15+%29%2F3+=+4%2A15+\"$
\n" ); document.write( " $\"+4%2A15+=+60+\"$
\n" ); document.write( "--------------
\n" ); document.write( "Multiply the top and bottom of $\"+7%2F15+\"$ by $\"+4+\"$
\n" ); document.write( " $\"+%284%2F4%29%2A%287%2F15%29+=+28%2F60+\"$
\n" ); document.write( "Multiply the top and bottom of $\"+5%2F12+\"$ by $\"+5+\"$
\n" ); document.write( " $\"+%285%2F5%29%2A%285%2F12%29+=+25%2F60+\"$
\n" ); document.write( " $\"+28%2F60+%2B+25%2F60+=+53%2F60+\"$ answer
\n" ); document.write( "------------------------
\n" ); document.write( "An easy way to check this is to use decimals from calculator:
\n" ); document.write( " $\"+7%2F15+=+.4666667+\"$
\n" ); document.write( " $\"+5%2F12+=+.4166667+\"$
\n" ); document.write( " $\"+7%2F15+%2B+5%2F12+=+.8833333+\"$
\n" ); document.write( "and
\n" ); document.write( " $\"+53%2F60+=+.8833333+\"$
\n" ); document.write( "OK \n" ); document.write( "

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