89 years
academic
attentive
boy
boys
casual clothing
chalk
chalkboard
child
childhood
chinese
chinese ethnicity
classroom
concentration
contemplation
development
education
elementary
focused
greenboard
hand on chin
indoors
information
innocence
intelligence
intelligent
knowledge
learning
lifestyle
looking
male
math
mathematics
multiplication
numbers
one person
problem
problems
school
school kid
schoolboy
solving
standing
student
study
studying
thinking
thoughtful
wisdom
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