black instructor erasing writing on whiteboard in classroom - blackboard eraser stock videos & royalty-free footage00:05
portrait of a boy erasing the blackboard in the classroom - blackboard eraser stock videos & royalty-free footage00:17
close-up of black teacher removing writing from whiteboard - blackboard eraser stock videos & royalty-free footage00:05
a man wearing a shirt and a wedding ring uses a blackboard eraser to wipe out mistakes in chalk on a free-standing blackboard placed in a large room lit by natural light before drawing the axis of a graph, uk. - blackboard eraser stock videos & royalty-free footage00:13
a chalk board animation of numbers countdown from 10 to 0 - blackboard eraser stock videos & royalty-free footage00:23
female teacher wearing face mask and writing on the blackboard at classroom. covid-19 concepts - blackboard eraser stock videos & royalty-free footage00:20