Question

If your paper has 128 rectangles, how many folds did you make?

Answer 1

If you fold a piece of paper, it will have 2 rectangles.
If you fold it again, it will have 4 rectangles.
If you fold it again, it will have 8 rectangles.
So, if you fold it n times, it will have 2^n rectangles.

$2^n=128 \\ 2^n=2^7 \\ n=7$

If your paper has 128 rectangles, you made 7 folds.