Lots of fun practice at https://www.sumdog.com/ !
MAKE SURE YOU KNOW YOUR LOG-IN DETAILS!
S1 teachers will set homework on sumdog on a regular basis (tasks can be printed off beforehand if access is proving troublesome!). It provides very useful feedback to learners and teachers and is linked to Curriculum for Excellence.
You can download the app if you prefer to work on your phone or tablet.
If you’re looking for even more practice, then https://www.mathsworkout.co.uk/login.php
has loads – just log-in (ask your teacher) and pick your topic.