The ninedigits workshop is an educational game aimed at learning mathematics for kids. It is based on the idea that children learn more effectively when they are involved in an activity they enjoy. 

In this game, the child is going to solve a puzzle in which he has to get the numbers from 1 to 9 in a square of 3 * 3 where the sum of the numbers of the two top rows is equal to the bottom row. 

The child is going to learn how to use the addition and subtraction operations, as well as how to add and subtract numbers within 1000. He is also going to learn how to get the correct results, which will be based on the properties of the addition and subtraction operations.