A free program for Android, by JoyPlot.

The Calculation Training app is a great brain-training game for kids and older adults. It can help them improve their mental arithmetic skills and their ability to calculate quickly and accurately. It’s a brain-training game for kids and older adults.

The app includes five different kinds of math calculation training such as addition, subtraction, multiplication, division, and other four arithmetic operations). It has a training time that can be set from 20 seconds to 90 seconds. It has two numpads to input numbers and answers. You can change the number of questions from 10 to 50.

Develop your mathematical abilities now.