67years
abacus
arithmetic
background
boy
brain
calculate
calculation
child
childhood
children
class
clever
complex
count
development
education
elementary
finance
fun
kid
knowledge
learn
math
mathematical
mathematics
maths
mental
mental arithmetic
mind
number
numbers
one person
school
schoolboy
smart
soroban
student
study
studying
success
traditional
training
white
yellow
young
定額
Schoolboy with abacus. Young kid training mental arithmetic - complex process that includes number management, manipulation of information and knowledge of mathematical conceptsの素材 [FY310152221191]
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