-9/10 = -27/30 -1/6 = -5/30 (-27/30) + (-5/30) = -32/30 = -1 1/15

Don't let the negatives throw you! You need a common denominator. What's a common denominator of 6 and 10? 60. 9/10 = what/60 ? 1/6 = what/60? Now that you have them both in sixtieths, just add to get your answer. But since they were both negative, your answer will also be negative. Does that give you enough?

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