Other countries, hey - well in my small area of NSW, Australia, my boys are going back to school 1 day a week at the moment, on a rota basis, so that they CAN manage as much social distancing as possible.
Single children at the primary school go in on either Mon or Tues, and those with siblings go in on either Thurs or Fri. Weds is just for keyworker children (who are there every day).
The staff are also rostered so that they don't cross over between student cohorts.
These numbers allow the children to be seated one per table and keep a 2m distance in the classroom. This is all ages, kindy to Y6.
The high school my DS1 goes to have a different approach - Y12 (our final year) are in every day because our exams are in November, so they're trying to give them their best shot - but then it's also Y7 in Mon, Y8 in Tues and so on. Classes are split between classrooms so that they can sit one per table, keeping 2m distancing. Their school yard assembly area has 2m spaced spots on it that the students are expected to stand on while waiting to go into class.
I don't know how they cope with breaks - but then they're outdoors, so it's slightly less problematic. Anyone with the slightest sniffle or anything stays at home. Anyone who doesn't wish to send their child back to school for whatever reason can keep them home.
We have still had ONLY 98 deaths in the whole of Australia - and yet this is what we are doing (at least in NSW, different states are doing it slightly differently).
Restrictions are being slowly relaxed here but with a view to locking down again if numbers start to rise quickly.