Answers

2014-09-23T19:16:30+08:00
Find there least common denominator or lcd

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2014-09-23T20:18:41+08:00
First, find their LCD.
take for an example: 2/5 - 3/8
their LCD is 40. then 40 ÷ 5(denominator of the 1st fract.) × 2 (numerator of the 1st fract.) =16 then copy 40 as its denominator so it becomes 16/40
After performing the first fraction, the second fraction next.
40÷8 ×3 = 15/40.
Lastly, subtract the fractions. 16/40 - 15/40. because their denominator was already the same, just simply subtract their numerator and copy the denominator. the answer is 1/40.
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