Addition and Subtraction Any D

以任何数字练习加法，减法和乘法。

Here is a simple app that will help anyone improve their math skills.

Features:

- Free and offline

- Suitable for any age

- Includes 3 basic operations: Add, Subtract and Multiply

- Set your own number range (sample: 1 to 3 or 20 to 2000 or 150 to 500 etc.)

- All numbers are randomly generated

- Timer is carefully adjusted depending on how many digits the answer has.

Modes:

Normal Mode

Play with no time limit. Your points will be based on the time consumed with a correct answer.

Beat D Clock Mode

Each challenge has a specific time limit. Give the correct answer before time runs out.