math problem check

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would some one please see if I am correct with these problems

1.Add. write the answer in simpliest form. 3/11 + 9/11 + 1/11=

13/11= 1 1/2

2. Subtract write the answer in lowest term.
19/24 - 7/24=
12/24 = 1/2

3. Victor owned 9/10 of a family business he sold 2/5 of the business to his daughter. What portion of the business does he still own?

9/10 - 2/5 = 9/10 - 4/10 = 5/10 - 1/2

4. Find the least common multiple of 24 and 48.

48

5. Which is larger,6/11 or 3/10 ? 6/11

6.Add 3/4 = 7/10 = 4/15=

1 43/60

You are mixing up = and + signs in #3 and #6. In #1, 13/11 does NOT = 1 1/2.

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