4k
academic
algebra
blackboard
calculations
chalkboard
chart
class
classroom
communication
concept
development
digital image
digitally generated
education
equation
formula
formulae
graphic
grid
idea
illustration
information
knowledge
learning
lesson
mathematics
montage
no people
number
research
school
studying
symbol
theory
thinking
working
定額
Image of handwritten mathematical calculations in white chalk floating over a grid on a chalkboard background 4kの素材 [FY310239162034]
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