Getting the Perfect Length on Cut-off Pants

I recently found some cool pedal pushers in my community center. I hate the length, but they fit for shorts, so I had to cut them down. Sometimes, getting each leg the same is a challenge.

So since they were pretty much all the same length, I cut the first ones. Laying them so the seams are together, as you might iron them, I made sure the hems were the same exact space from the inseam to the hem.

Then I cut them and tried them on. Determining that they were just right, I kept the bottom I had cut off.

Placing each one as I had the first, I used the hem part that I had just cut off to measure the second pair. Then the third.

Knowing that each one is exactly like the other two keeps me from getting the wrong length, thus ruining the pants. These were free, so it didn't matter "that much" if I got them wrong. But, I still didn't want to, and I am guessing neither do you!
N-JOY!!