can someone check this for me

11)Subtract

5/6 -3/5

1/3 + 1/5 + 1/10

13) Divide .write each result in simplest form:
8/9 (divided by) 11/15

5/6-3/5 is like saying:
25/30-18/30
= 7/30

To check the first question, we can subtract 5/6 - 3/5 by finding a common denominator, which in this case is 30.

To find the common denominator, we multiply the denominators of both fractions: 6 * 5 = 30.

Then we convert both fractions to have a denominator of 30:
5/6 is equivalent to 25/30 (multiply the numerator and denominator by 5),
3/5 is equivalent to 18/30 (multiply the numerator and denominator by 6).

Now, we can subtract the fractions: 25/30 - 18/30 = 7/30.

So, the correct answer is 7/30, rather than 0.23.

To check the second question, we can add 1/3 + 1/5 + 1/10 by finding a common denominator, which in this case is 30.

First, we find the least common multiple (LCM) of the denominators 3, 5, and 10. The LCM of 3, 5, and 10 is 30.

Then, we convert each fraction to have a denominator of 30:
1/3 is equivalent to 10/30 (multiply the numerator and denominator by 10),
1/5 is equivalent to 6/30 (multiply the numerator and denominator by 6),
1/10 is equivalent to 3/30 (multiply the numerator and denominator by 3).

Now, we can add the fractions: 10/30 + 6/30 + 3/30 = 19/30.

So, the correct answer is 19/30, rather than 0.63.

To check the third question, we can divide 8/9 by 11/15 and simplify the result.

To divide fractions, we multiply the first fraction by the reciprocal of the second fraction.

Reciprocal of 11/15 is 15/11.

So, we can rewrite the division as: 8/9 * 15/11.

Multiplying the fractions:
(8 * 15) / (9 * 11) = 120/99.

To simplify the result, we can factor out the greatest common divisor (GCD) of the numerator and denominator, which is 3.

So, 120/99 simplifies to (120/3)/(99/3) = 40/33.

Therefore, the correct simplified result is 40/33, rather than 1 and 1/20.