Question 348932: -3/4 +2/5
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! -3/4 +2/5
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Find a common denominator. The product always works, even if it's not the LCD (Least Common Denominator). Schools are obesessed with the LCD for no good reason.
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4*5 = 20, the common denominator (also the LCD)
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-3/4 +2/5 = -15/20 + 8/20
= (-15 + 8)/20
= -7/20
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