abacus
arithmetic
back to school
bead
bead calculator
bead counter
body part
boy
brain
business
busy
calculate
calculating
calculator
child
childhood
classroom
course
cute
development
do math
doing
education
finance
finger
hand
home
homework
kid
learning
little
math
mental
mental arithmetic
mental math
number
person
playing
school
schoolboy
studying
subtraction
toy
use
using
定額
Doing mental math or mental arithmetic. Hand of little boy using abacus for calculating. Learning to use abacus on mental math courses. A kid doing math at home with abacusの素材 [FY310179341585]
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