Fold a sheet of paper into eighths by folding into half ~ then half ~ and then again ~ or any other way you find most easy. The picture ~ below ~ shows what it should be like when you unfold it.
Fold the sheet back into half. With the paper now doubled prepare to cut from what was the central point of the open sheet. This point is now at the centre of the folded edge. Using the central fold as a guide (here marked in black) cut through the two layers of paper. Stop when you meet the fold that lies across your path (dotted blue). The red triangular stop sign marks the end of the snip.
Loosely fold the two long edges towards each other. Also bring the two short edges towards each other. Jiggle the sheet so that the slit widens out.
As your hands close-up together try to encourage a X shape to form.
Fold the flaps of the cross-shape to one side, say on the left. Fold the edge in your right hand (my hand is missing in the picture - it is holding the camera). You have finished! Some of the creases will need to be re-pressed. Every page is double-thickness. If you make a booklet by starting with a printed sheet you will have to think about the layout of the pages! Our numbers, and one of the earlier pictures will help.