초중등 사칙연산

Contents
1. Addition of integers
2. Subtraction of integers
3. Multiplication of integers
4. Division of integers
5. Finding Prime Numbers (Sieve of Eratosthenes)
6. The greatest common factor, least common multiple
7. Addition of fractions (step by step)
8. Addition, Subtraction of Fractions
9. Multiplication and division of fractions
10. Addition, Subtraction of Decimals

Master the arithmetic by creating an unlimited number of problems. After solving the problem, you get a score. Incorrect questions are displayed in red, so try solving them until you reach 100 points. When you reach 100 points, the time it took to solve is displayed. Keep practicing so you can solve each page in 1-2 minutes. You can check your ranking by checking the ranking.
If you do not know how to solve, click the video button to watch a short explanation.

Added the ability to share what you have learned with others.