Pupils could be taught online one day a week to help schools balance the books, a council has suggested.
สมัครสมาชิก SLOTXO Straight Web 30 free spin slots, withdrawable Don't share Get it now. Play and have fun with tons of slot games with new updates.
Wearing coats in classrooms and leaving jobs unfilled are other cost saving ideas sent to headteachers in Powys in a briefing document.
Every option must be considered to deal with a financial crisis, said the county's cabinet member for education.
Each school will be asked to decide for itself how to make significant savings next year.
Pete Roberts, the Powys cabinet member for education, told a meeting of the council that school budgets were being looked at "in detail" for "potential solutions".
"We did suggest the possibility of a four-day week," Mr Roberts said, "with a fifth day being taught virtually as well as blended weeks of learning as extreme cases for consideration."
But he stressed schools had been given no "clear directive" to do this, according to the Local Democracy Reporting Service.
"Ultimately it is the decision and responsibility of the headteacher and their chair of governors regarding the school budget," he said, "and one size does not fit all."