Hundreds of thousands marched in cities across France on Saturday in largely peaceful protests to support schoolchildren’s demands for more teachers and repairs to dilapidated buildings, as Emmanuel Macron faces a social and political crisis in his final months as president.

In Paris, at least 110,000 people marched along the eastern edge of the city, according to government estimates. They supported high schoolers but also complained of the high cost of living and the government’s heavy policing, saying riot police had been sent to target school protesters over the past month, instead of the government offering political solutions.

The mood in Paris on Saturday afternoon was peaceful and lighthearted, with brass bands playing and children and grandchildren present.…