The test is intended for primary school students and those who want to learn or test knowledge of the mathematical addition and subtraction tables. - The test has two options:   * simple, and   * time limited. - The test consists of 8 levels and each level consists of 8 questions. - Questions are always asked randomly. - 3 answer options + option "other" - The correct answer is shown after each incorrectly answered question. - At the end of the test, incorrect answers are shown on the addition