Teacher writing formulas on the chalk Board and explains the students the formula.
Teacher writing formulas on the chalk Board and explains the students the formula.
Animation of yellow chalk writing the English word 'mathematics' on a board. Animation of yellow chalk writing the English word mathematics on a black chalkboard.
Animation of purple chalk writing the English word 'chemistry' on a blackboard. Animation of purple chalk writing the English word chemistry on a black chalkboard.
Schoolgirl writing on chalkboard with chalk in classroom at school 4k
A closeup of writing letters on a chalkboard
Professor teaching physics to students in college
Female hand writing formulas on blackboard with chalk close up 20s 4k.
Animation of green chalk writing the English word 'teaching' on a blackboard. Animation of green chalk writing the English word teaching on a black chalkboard. The camera slowly moves down.
Scientist woman writing a formula while facing the camera