A programming curriculum meant to be a step between things like Scratch and Python. It gradually introduces concepts and syntax so the student isn't overwhelmed by e.g. punctuation. It also localizes keywords to a student's language, so e.g. print and for are translated into Chinese, Spanish, etc.
The idea is, rather than performing carries, just write down the "fat" number in its place.
For example, adding 1234 + 5678:
1 2 3 4
5 6 7 8
----------
6 8 10 12
6 8 11 2
6 9 1 2The result is 6912.
Instead of carrying at each digit, you "normalize" at the end. This could be useful for elementary students struggling with the concept of carrying.