Achteraanzicht van grijze haren professor kijken naar blackboard - Stockfoto’s en -afbeeldingen

Rear view of senior lecturer writing something on blackboard with piece of chalk

Back view of senior lecturer writing something on blackboard with piece of chalk

Grey hair professor drawing with piece of chalk at blackboard

Senior teacher in 3d classroom

Cropped image of senior professor pointing on something with pencil on blackboard

Cropped image of professor drawing with piece of chalk at blackboard

Cropped view of african american teacher writing on chalkboard

Cropped view of man with chalk writing numbers on blackboard

Cropped view of two multicultural schoolgirls writing on chalkboard isolated on white

Panoramic shot of schoolchild holding chalk near chalkboard on green

Smiling african american teacher with pointer standing near chalkboard and blurred schoolkid in classroom