Männlicher Lehrer in offizieller Kleidung wischt mathematische Gleichungen im Klassenzimmer mit Schwamm ab - Stockfoto & -bild

Male teacher wiping mathematical equations with sponge from chalkboard in classroom

Male teacher in formal wear writing equation on chalkboard in maths class

Young smart mathematician drawing math formulas on the chalkboard and thinking: he is solving problems and discovering new theories

Male teacher sitting at desk, pointing finger in air and explaining equations in maths classroom

Teacher pointing at equations in classroom with student

Female teacher looking at camera and pointing with finger at mathematical equation on chalkboard in class

Crumpled paper balls flying at frightened female teacher in classroom with chalkboard on background

Beautiful pensive female teacher in formal wear and glasses in classroom

Cropped view of male student wiping mathematical equations with sponge in classroom

Female teacher in glasses sitting at desk and pointing at laptop with blank screen in classroom

Beautiful female teacher with wooden pointer explaining mathematical equations in classroom

Female teacher sitting at computer desk, holding glasses and having headache in class

Crumpled paper balls flying at frightened female teacher in classroom with chalkboard on background

Female teacher in glasses sitting at computer desk and holding apple in classroom