abacus
abacus classroom
arithmetic
background
background material
board
bookkeeping
boy
business
calculate
character space
childhood
children
class
classroom
commerce
concept
copy space
count
education
elementary
elementary school
finance
financial
glasses
image
indoor
learning
lessons
math board
mathematics
mental
mental arithmetic
mental calculation
oldstyle
pencil
school
school life
student life
study
table
test
text space
traditional
uninhabited
unmanned
white
white background
white bag
wooden