The initial section formulates terms that will be used as numbers, expressions and functions from all other sections of mathematics up to high school. The rules without which it is inconceivable to study the mathematics of senior classes are stated. Knowing the signs of separability helps to count quickly and correctly. The course is easy to learn, easy to repeat, and forbidden to forget.

Mental Math Trainer

Online test to test your knowledge of the multiplication table and your oral counting skills. Select the arithmetic action, number of questions in the test, and proceed to test your addition, subtraction, division, or multiplication skills.

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