active
back to school
blackboard
book
chalkboard
cheerful
child
childhood
class
classroom
courses
day
desk
development
education
exercise
formal
geometric
geometry
girl
grade
informal
instrument
kid
knowledge
learn
lesson
math
mathematics
nonformal
online
primary
protractor
pupil
question
read
ruler
school
stem
study
table
teacher
teaching
teen
test
tool
triangle
trigonometry
work
working
定額
childhood development. get knowledge through study. kid in classroom study geometry. child hold math ruler. back to school. formal education in modern life. home schooling concept. Math graphic toolsの素材 [FY310184627137]
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