https://www.topmarks.co.uk/maths-games/hit-the-button
https://www.proprofs.com/quiz-school/story.php?title=multiplication-hard
https://www.transum.org/Maths/Game/BIDMAS/
https://www.topmarks.co.uk/maths-games/7-11-years/multiplication-and-division
https://www.random.org/dice/?num=4