<PRE><B>Question 242113</B>
4 4/15 + 2 4/39=
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(15*4+4)/15 + (39*2+4)/39
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(64/15) + (82/39)
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Use prime factor form to find the least common denominator:
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15 = 3*5
39 = 3*13
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The lcm is 3*5*13 = 195
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Rewrite each factor with the lcm as its denominator:
(64*13/lcm) + (82*5/lcm)
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Combine the numerators over the lcm:
(832 + 410)/lcm
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1242/(195)
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Cheers,
Stan H.</PRE>