Cropped view of man writing numbers with chalk on blackboard - Stock Photo & Image

Cropped image of professor drawing with piece of chalk at blackboard

Panoramic shot of man writing with chalk on blackboard

Cropped view of african american teacher writing on chalkboard

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

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

Grey hair professor drawing with piece of chalk at blackboard