Divide by 10
https://www.bbc.co.uk/bitesize/articles/z2fvp4j
Multiplying and dividing by 3
https://www.bbc.co.uk/bitesize/articles/zmr43j6
Multiplying and dividing by 8
https://www.bbc.co.uk/bitesize/articles/zvvsy9q
Multiply a 2 digit number by a 1 digit number