Brain Blaze Divide by imak creations is a fantastic resource for classroom use. It’s a flashcard system that starts simply and progresses through 16 levels of increasing difficulty. Children can view their progress through the game so they can find out which calculations they are having difficulty with and which they are taking too long to work out mentally.
Children in my class have responded favourably to this app and have asked me many times if they could use it again during Maths. It encourages children to perform better and also creates a healthy competitive edge when they try to succeed faster through the levels.
The game is perfect for KS2.