1
2
4
add
addition
alphabet
answer
arithmetic
background
black
blackboard
board
calculate
calculation
chalk
chalkboard
class
classroom
concept
drawing
education
elementary
equation
exam
four
hand
holding
kid
knowledge
learn
lesson
math
mathematics
number
plus
primary
school
solution
study
sum
symbol
teach
teacher
text
two
white
work
write
定額
Teacher writing various primary school maths formula on chalkboard ..の素材 [FY310176728218]
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