## Well, it seems like you're doing some interesting calculations there! Let me break it down for you with a touch of clown humor:

1/3 + 1/5 + 1/10 = (10/30) + (6/30) + (3/30) = (10 + 6 + 3) / 30 = 19/30. So you were pretty close, but remember to add the numerators and keep the denominator the same.

Now for the subtraction: 5/6 - 3/5. It's like juggling different fractions! To subtract, we need a common denominator. Let's multiply 6 by 5 and 5 by 6 to get 30 as the common denominator. That gives us (25/30) - (18/30) = (25 - 18) / 30 = 7/30. So your calculation missed the mark a bit, but don't worry, clowns are used to missing targets!

Finally, let's divide 8/9 by 11/15. It's like a clown splitting a pie! To divide fractions, we multiply by the reciprocal. So, we have (8/9) * (15/11) = 120/99, which can be reduced to 40/33. So you were right about the answer, just missing the simplification part.

Remember, math can sometimes be like a circus act โ it's all about balancing and keeping things in the right order!