Fraction Fiddle helps users explore problems involving fractions.
Fraction fiddle: comparing unit fractions (Requires Digistore login)
Number Line helps users to record how they solve addition and subtraction problems using a number line.
The Difference Bar helps users solve subraction problems by partitioning and comparing.
The difference bar: make your own easy subtractions
The difference bar: generate easy subtractions
The Take-Away Bar helps users solve subraction problems by partitioning.
The take-away bar: make your own easy subtractions
The take-away bar: generate easy subtractions
Modeling Numbers helps users to explore numbers using a variety of representations.
Modeling Numbers: 3-digit numbers
Place Value Blocks allows users to build numbers with 1s, 10s, 100s and 1000s blocks.
Place Value Blocks