adult

back

beautiful

beauty

blackboard

board

boy

business

calculations

caucasian

chalk

chalkboard

cheerful

child

class

classroom

college

communication

concept

draw

easy

education

elementary

explaining

female

formulas

four

happy

kid

knowledge

learn

learning

lesson

math

mathematical

numbers

occupation

one

person

portrait

russian

school

science

smart

smile

standing

student

study

studying

teacher

text

write

writing

young