Answers

2014-07-10T18:57:59+08:00
4/5 - 8/7 cannot be subtracted since they don't have the same denominator.
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But you can achieve the difference by getting the LCD and to get the LCD you must Determine the Greatest Common Factor of 4 and 8 which is 2, then Either multiply the numbers and divide by the GCF (4*8=32 and 32/2=16) or Divide one of the numbers by the GCF and multiply the answer times the other number (4/2=2 and 2*8=16), then rename or transform the fractions using the LCD as the denominator(4/5=4/16 and 8/7=8/16). Now we can subtract the fractions. 4/16-8/16=4/16 or 1/4
12/35 is my answer
2014-07-11T10:24:05+08:00
Since 8/7 and 4/5 are not the same denominator you should get the LCD which is 35. so the answer 12/35
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