There is a learning application called 9a Math Kingdom. I suggest you try it for your children. Thinking training can help them solve the same type of problems in many ways. It is very helpful for the development of children's mathematical thinking! Parents should not worry about their children's learning, nor should they put too much pressure on their children, lest they have resistance to learning. 9a Mathematics Kingdom is rich in colors and animations, so that children can learn in games and fall in love with mathematics.