英文關鍵字
abacus
addition
arithmetic
baby
boy
calculation
caucasian
child
count
decision
difficulties
education
elementary
exam
example
exercise
floor
grade
home
homeschooling
homework
indoors
kid
knowledge
learn
lesson
logic
math
mathematics
numbers
prepare
preschool
problems
remember
remote
school
schoolboy
simple
skill
solve
student
study
subtraction
task
test
textbook
think
workbook
write