8 years
abacus
account
arithmetic
at home
back to school
boy
brain
busy
calculate
calculation
child
childhood
class
classroom
count
course
development
do homework
do math
do mathematics
education
hand
homework
kid
knowledge
learn
learning
math
math classes
mathematic
mental
mental math
mental mathematics
mind
mixed race
multiracial
pupil
school
schoolboy
smart
study
studying
thinking
using
work
young
定額
Schoolboy do mental math. Mental mathematics. 8 years old multiracial boy busy with mental arithmetic. Boy in math courses. Doing homework, math at home. Boy works on the accounts of mental arithmeticの素材 [FY310178122679]
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