algebra
arithmetic
blackboard
board
bokeh
calculate
chalk
chalkboard
childhood
class
classroom
cognition
college
concept
divide
division
drawing
education
elementary
elementary school
equation
example
exercise
formula
handwriting
homework
horizontal
indoors
learn
lesson
math
mathematics
no people
nobody
number
operations
primary
school
schoolwork
student
study
written
定額
Blackboard with primary math formulas written with chalk. Childhood education concept. Selective focusの素材 [FY310173621189]
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