Know Abacus Pro 1.21

Abacus is a wonderful mathematical instrument used for calculation. This app will help your kids to learn about Abacus, numbers, counting, addition and subtraction. It is the first step in harnessing the untapped potential of their brains and unleashing their mathematical abilities.
Characteristics:
* Mental math
* Review lessons
* Unlimited random lessons
* Add a new colorful abacus
* Learning modes
* Abacus with two or more keys
Supported Android
{2.3 and UP}
Supported Android Version:-
Jelly Bean(4.1–4.3.1)- KitKat (4.4–4.4.4)- Lollipop (5.0–5.0.2) – Marshmallow (6.0 – 6.0.1) – Nougat (7.0 – 7.1.1) – Oreo (8.0-8.1) – Pie (9.0)