False.
To justify:
5 x 2/3 means to take 5 and find 2/3 of it. This is equivalent to multiplying 5 and 2/3, which results in 10/3 or 3 1/3.
10 x 1/3 means to take 10 and find 1/3 of it. This is equivalent to multiplying 10 and 1/3, which results in 10/3 or 3 1/3.
The two expressions have the same value of 3 1/3, but they are not equal to each other. Therefore, the statement is false.