Children's knowledge of number facts and recalling these quickly are vital as they progress through the year groups. Knowing number facts quickly will ensure they can progress onto and use written method effectively higher up in the school. Below you will find links to games and activities which children can do at home.
The Number Facts in KS1 PPT explains all the number facts they should know and what order you can help them learn them.
Bare Necessities is a booklet of simple games which can be played at home written by Wiltshire Maths.
As well as these documents, I have listed some useful websites for games related to maths.