art
background
banner
blackboard
board
brown
chalk
chalkboard
class
classroom
close
closeup
concept
creative
creativity
derivative
design
education
educational
equation
fraction
handwriting
knowledge
learn
learning
lesson
math
mathematics
multiply
person
picture
school
sign
sketch
sketching
smart
student
study
studying
symbol
teacher
teaching
text
texture
up
word
write
writing
定額
Textured brown chalkboard background. Derivative equation is written on the board with a piece of white chalk. Close up shot.の素材 [FY310216302730]
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