


Algorithms
Practice written addition and subtraction using the standard algorithm with trading, carrying and borrowing with MAB diagrams..

Square Numbers



🔢 Number Extender – Place Value
Explore how a number like 9876 can be expressed as 9 thousands + 8 hundreds + 7 tens + 6 ones, or as 98 hundreds + 7 tens + 6 ones. Use the Fold and Unfold buttons to discover all the ways to describe any number.










