Thanks, Jan and Sue. It's synthetic and wool sock yarn that I have that said not to put it in the dryer. I generally air dry anything I can, my dryer is very expensive to run and I actually prefer drying things on racks most of the time. That's good to know about socks not shrinking, I've swatched and washed and dried in the dryer, just in case things do go in it, and hadn't noticed any shrinkage.
I should never overestimate my basic arithmetic skills.
When you lay the sweater out to dry, don't hang it over anything or it will stretch out. Lay flat, as the directions say, and you can push it around a bit so it's not pulled out of shape anywhere. My grandmother used to gather the wrists of a sweater and baste them closed to keep the shape small as the sweater dried.