Here are some links to online maths games.
Daily 10 is a primary maths resource for primary teachers which covers addition, subtraction, ordering, partitioning, digit values (place value), rounding, multiplication, division, doubles, halves and fractions. It has been designed primarily for use on an interactive whiteboard. The aim is to help teachers deliver 10 maths questions many which can be used for mental maths practise.
Fractions and Decimals games
Free fun maths games can help children's understanding of fractions and decimals. They cover a range of skills from identifying basic fractions of shapes and numbers of objects to ordering fractions and converting fractions to decimals or percentages. There are also games involving finding equivalences and cancelling down.
Maths lessons including powerpoints, activities and answers