In this game you can test your knowledge by adding three, four and five digit numbers. The game is suitable for students in grades 2-3-4. The game has only 3 levels, which differ in the length of the numbers for addition. Remember that adding numbers always goes from right to left. If as a result of adding several digits we get the sum equal or greater than 10, the one is added to the next digit, and in place of the question mark is placed digit, which remained. For example, if we add 8 and 7, we get 15.