academic
algebra
blackboard
board
chalk
chalkboard
cheerful
class
classroom
college
demonstrating
discussing
drawing
education
equation
exam
explaining
formula
formulas
green
happy
knowledge
learning
lecture
lecturer
lesson
math
mathematical
mathematician
mathematics
number
physicist
physics
presenting
school
science
scientific
showing
smiling
solution
standing
student
study
studying
teacher
teaching
test
tutor
university
woman