How to multiply in your head https://www.bbc.co.uk/bitesize/topics/z36tyrd/articles/zwghk2p
2 times https://www.bbc.co.uk/bitesize/topics/zqbg87h/articles/zc7ygdm
5 times https://www.bbc.co.uk/bitesize/topics/zqbg87h/articles/zw8qxfr
10 times https://www.bbc.co.uk/bitesize/topics/zqbg87h/articles/zq3rk2p