Barvember - a bar model a day... - This is a useful online way of creating your own bar models. It even has some problems for you to have a go at solving. They are in different styles too (eg: find the whole given a part).
Fractions - Multiplying fractions game
Multiplication Formula 1 - Play this game to improve the speed of your tables recall. Can you come first? Can you play against somebody else?
Long division - Use this tool to support long division calculations. You can show the multiplication table fact box for your divisor if you click the box on the right.
Geogebra - percentage visualiser - See how the different percentages relate to fractions
Geogebra - mental percentages - Test yourself to work out some percentages mentally - what is the trickiest percentage you can find?