Mathematics
Why Zero Makes Place Value Work
Why zero makes place value work: learn how an empty place keeps 204 distinct from 24 and helps you read each digit’s…
subjects
Mathematics
Explore number, shape and patterns by following the ideas behind familiar rules.
Our approach
Understanding grows through connections
A definition gives an idea its edges; examples and careful comparisons show what it can do. We make those connections visible without pretending that one explanation settles every question.