I started by printing off the task cards four sets of cards to a page.
Then, I gave each group of four students a stack with all of the task cards (There were 5 quarter sheets of paper with four task cards on each for them to cut apart). I instructed them to cut them apart and give one card from each piece of paper to each student in their group. Therefore, they all ended up with five cards, one from each sheet of cards.
I chose to do it this way so that they all ended up with a different task card, but they were all working on similar type questions. This made it even more beneficial for them when they had to check each other's work.
The students glued them on the left side of their notebooks, answered the questions, and justified their answers. That was a HUGE part of this, and of course some of them had trouble with it. I am so glad that I required them to justify their answers--writing in math is such a huge focus for us, and they need all the practice they can get.
As I mentioned before, they traded notebooks with someone else in their group and checked to see if they agreed with the answers. This is where it came in handy to have them all working on different cards.
You could easily differentiate with task cards in the notebooks, too. Most of my math task cards are differentiated so that students have many different ways to show their understanding!