Basic concepts of ordinary and decimal fractions.

Finding the Greatest Common Divisor (GCD) and Least Common Multiple (LCM).

Use the solved examples to understand the formatting required for school exams and "VPR" (All-Russian Progress Tests).

Addition, subtraction, multiplication, and division of whole numbers.

If your answer differs, use the GDZ to find exactly which step (e.g., a sign error or a miscalculation in long division) went wrong.