You can create multiple card with different mathematical operators such as Addition, Subtraction, Multiplication, Division, Square, Cube with a valid range of selected numbers. You can also set predefined number of questions per set like 25, 50 and 100, also you can set timer and sound per question set. After completing the test card set result will automatically stored and you can share your result score card with your family and friends. If you have created many cards of different variation then moving from one device to another or new device is very easy. Just create a backup of cards and share this file with the new device and import this backup file on other device.