Compute 1/3 + (-2/5).
A-1/15
B1/15
C-7/15
D-1/8
Answer & Solution
Correct answer: A. -1/15
A common denominator is 15. 1/3 = 5/15 and -2/5 = -6/15. Adding gives (5 + (-6))/15 = -1/15. Option C drops the sign on the first term. Option D adds the denominators, which is never the rule.
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