We played a fun game called Stone Age Stu at school today and the children asked if I could put the link on the blog for them. You can set the difficulty level. We played '2 digit + 2 digit' on 'normal' level. Have fun! There are lots of other great games on this free website to practice your maths skills and you do not need to register for an account.

https://mathsframe.co.uk/en/resources/resource/570/Stone-Age-Stu-Addition