Mathematics

Tuesday, September 22, 2026
in Education, Mathematics, RPN
3 min read

Reading an Expression Tree as a Postfix Program

An expression tree can make postfix notation less mysterious: finish each branch before visiting the operation above it. The Learning Lab expression-tree board turns that traversal into an arrangement of removable tokens.

Tuesday, September 22, 2026
in Education, Mathematics, RPN
3 min read

Teaching Fractions as an RPN Sequence

Fractions create two useful RPN questions: what quantity does a numerator and denominator represent, and what sequence turns those quantities into a result? The Learning Lab fraction studio keeps those questions side by side instead of asking a learner to jump straight to a symbolic entry.