So, here's how you make these things. First print out the journals. The first 2 pages should be back-to-back, as well as the last two pages.
I printed page numbers at the bottom of each page. Take the paper with pages 4, 7, 8, and 3 on it and cut it like the photo above. Make sure to make cuts at the top and bottom.
Take the other paper (pages 2, 5, 6, and 1) and cut a line down the middle like the photo above.
Now, let's go back to the first paper (pages 4, 7, 8, and 3) and hold page 4 like this (4 is inside the roll, 3 is on the outside).
Take the first paper (the one in your hand) and insert it into the second paper. The second paper should have pages 2 and 5 facing up.
Pull that paper all the way through and there you have it. Your very own math journal on the cheap.