When the slider slides to 10, children can intuitively see that 1 corresponds to 9, 8 corresponds to 2, and 7 corresponds to 3, and so on, so that they can easily grasp the number decomposition within 10.

The second type: addition and subtraction within 10.

When the slider slides to any number of 1, such as 7, children can be told that the sum of 1 and 6 behind the slider is equal to 7, 7 minus 6 equals 1, and 7 minus 1 equals 6; And so on.