calculation blackboard chalk university educational institution educational
Size: 4500px × 3375px
Photo credit: © jordygraph / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: algebra, blackboard, board, calculation, chalk, classroom, complex, education, educational, equation, establishment, formulate, institution, learn, mathematics, numbers, problem, room, school, science, study, university, written