Wrong, the factor of 1 is only 1.

2. The reciprocal of a false score is not necessarily a true score.

That's right.

3. If the outer product of a proportion is 1, then the two inner terms are reciprocal.

That's right.

4, the number greater than zero is reduced by 20%, and the result is smaller than the original number.

That's right.

5. If a×b×c= 1, then a, b and c are reciprocal.

Wrong.

6. The area of a square is out of proportion to the side length.

That's right.

7. 150/ 120 cannot be converted to a finite decimal.

wrong