Dynamic Tools helps users explore fractions of shapes and grids (more info).
Shape fractions
Dynamic fractions

Fraction Fiddle helps users explore problems involving fractions (more info).
Fraction fiddle: comparing unit fractions

Number Line helps users to record how they solve addition and subtraction problems using a number line (more info).
Number Line

Scale Matters helps users explore numberlines with a variety of scales (more info).
Scale matters: tens
Scale matters: hundreds
Scale matters: simple units

The Array introduces users to the array model of multiplication (more info).
The array

The Difference Bar helps users solve subraction problems by partitioning and comparing (more info).
The difference bar: make your own easy subtractions
The difference bar: generate easy subtractions
Difference bars

The Part Adder helps users add numbers by partitioning and combining (more info).
The partadder: make your own easy sums
The partadder: generate easy sums
The partadder

The TakeAway Bar helps users solve subraction problems by partitioning (more info).
The takeaway bar: make your own easy subtractions
The takeaway bar: generate easy subtractions
Takeaway bars

Wishball is a game involving addition and subtraction with place value (more info).
Wishball: tens
Wishball: hundreds
Wishball challenge: tens
Wishball challenge: hundreds

NLVM: Fraction manipulatives
Fraction pieces
Fractions: visualising
Fractions: parts of a whole

NLVM: Number manipulatives
Numberline arithmetic
Numberline bars
Diffy
