I fold mine by working into the corners. I'll try and describe, but it is difficult to explain even when I have the person and the sheet. I'll describe for a single bed, because that is easier to learn, but the principle works for bigger.
1. fold in half longwise 2. nest the corners together from each long side - I do this by sticking the corners of the top edge one on each hand, and then wrestle the bottom edge on top. 3. bring the corners together, so that your hands touch through four layers of fabric 4. flip one pair of corners on top of the other pair. The top of the sheet should now be four layers thick, and with a bit of shaking (and maybe grabbing the fold diagonal from the corner you are holding) should sit flat 4. Ignoring the short edge, straighten the long edge so that the skirt of the sheet is sitting flat against the big folded section 5. tidy up the corner so that the short section is also sitting flat. Think of it as folding paper for gift wrapping, if that helps.
At this point, you have something that is sufficiently rectangular that you can fold as if it is. Fold 'inwards' so that the elasticated edges are tucked in to the middle. This is the bit where you have to work out what fits on your shelf, and fudge a bit.
As an extra - I find this easiest to do when taking them off the line, as it enables me to get a good grip on the first two corners. I have no idea how one does it if one is using a dryer.
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1. fold in half longwise
2. nest the corners together from each long side - I do this by sticking the corners of the top edge one on each hand, and then wrestle the bottom edge on top.
3. bring the corners together, so that your hands touch through four layers of fabric
4. flip one pair of corners on top of the other pair. The top of the sheet should now be four layers thick, and with a bit of shaking (and maybe grabbing the fold diagonal from the corner you are holding) should sit flat
4. Ignoring the short edge, straighten the long edge so that the skirt of the sheet is sitting flat against the big folded section
5. tidy up the corner so that the short section is also sitting flat. Think of it as folding paper for gift wrapping, if that helps.
At this point, you have something that is sufficiently rectangular that you can fold as if it is. Fold 'inwards' so that the elasticated edges are tucked in to the middle. This is the bit where you have to work out what fits on your shelf, and fudge a bit.
As an extra - I find this easiest to do when taking them off the line, as it enables me to get a good grip on the first two corners. I have no idea how one does it if one is using a dryer.