Schools across France on Monday held a minute of silence for the teacher stabbed to death in what President Emmanuel Macron called an act of "Islamist terror", reports FRANCE 24.
Earlier in the day, Macron called for a "ruthless" government response to those in France with terrorist ideologies.
The nationwide tribute comes a day after thousands gathered in Arras, northeastern France, to pay their respects to 57-year-old Dominique Bernard.
His killing on Friday has sent shockwaves through the country and led to calls for tighter security at schools. The government has already put the country on high alert and deployed 7,000 troops.
The attack in Arras, home to large Jewish and Muslim populations, came against a backdrop of growing conflict in the Middle East.
The suspected perpetrator, a 20-year-old Russian man, has been arrested for the killing and for having also seriously wounded three others at the school he used to attend.
"Arras is being tested, but Arras is standing ... we are standing," Mayor Frédéric Leturque told a crowd of more than 5,000 people gathered in the central square Sunday.
Of those wounded, one who was hospitalised with the most serious injuries "seems to be better", a source close to the matter told AFP.
France's president on Monday called for a "ruthless" government response to those with terrorist ideologies in the wake of the attack.
He has called on police to comb through their files of radicals who could be deported from France to make sure no one was overlooked and has told the interior minister to take a "special approach to young men between the ages of 16 to 25 from the Caucasus", the aide said.