توضیحات:

Addition and subtraction games for children - game, practice and learning.
Instructions: try to answers 20 questions as long as the time on the clock is not over.
- For each correct answer you will gain extra time.
- For each incorrect answer there will be a shortage of time.

You can choose between the games:
- Addition .
- Subtraction.
- Addition and subtraction.

In addition, you can choose between 3 difficulty levels: easy / medium / hard.
At each level a different extra time will be given and melee depending on the level of difficulty.
Enjoy!