Learn to calculate with numbers up to 20 or 100. Task that you haven't solved, will be repeated after a while. This app is reduced to only some features, to focus on learning at all.
- smaller fixes
9Apps 4.9
![국세청 홈택스 [손택스] on 9Apps](https://go.getnew.app/sg/res/jpg/f7/df/69cc2f90120ec331db2630e0f5b6-6dh.jpg?x-oss-process=style/jmq200)
