document.write( "Question 280163: I need help with addition and subtraction of fractions. Example 8 7/8 - 3 4/9
\n" ); document.write( "I need to show my work, can you help \n" ); document.write( "
Algebra.Com's Answer #203613 by Alan3354(69443)\"\" \"About 
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I need help with addition and subtraction of fractions. Example 8 7/8 - 3 4/9
\n" ); document.write( "8 7/8 - 3 4/9
\n" ); document.write( "Change to improper fractions, not mixed
\n" ); document.write( "71/8 - 31/9
\n" ); document.write( "Find a common denominator, 8*9 = 72
\n" ); document.write( "Change to common denominators
\n" ); document.write( "639/72 - 248/72
\n" ); document.write( "= (639 - 248)/72
\n" ); document.write( "= 391/72
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\n" ); document.write( "You can change it to a mixed fraction, but there's no reason to do that.\r
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