Sumas y Restas 2 play online

From the most basic level...
It consists of three levels per operation.
The first level with one-digit operations.
The second level with operations of three figures but still simple.
The third level with three-digit operations but a little more complicated... For addition with carrying operations and for subtraction with lending operations

It also provides information on each practice:
- Number of hits and misses
- Shows the errors and their corrections