An estimated 420 million children are living in war zones. In 2017, 262 million children were thought to be out of school.

The worst areas affected are Africa and the Middle East, in countries like Syria, Yemen, and Iraq.

Schooling continues, in whatever way it can, but it's not a long-term solution.

Visit Business Insider's homepage for more stories.

Conflict around the world is costing hundreds of millions of children their educations.

In 2019, Save the Children said one in five kids were living in a conflict zone. In February, the non-profit estimated 420 million children were living in war zones, and in 2017, the United Nations estimated 262 million children were out of school, because of conflict.

In war-torn countries like Yemen, Syria, and Iraq, classrooms have formed wherever possible — beneath trees, in the skeletons of bombed-out schools, or on special buses. Classes continue, even when walls have been reduced to rubble and sunlight pours in through holes in the roof.

These photos show what it's like to go to school in a war zone.