Nice work !Math is clearly explained in detail.
I think keeping my skills throughout our lives, an important part of our fitness. Whether you’re doing fractions or decimals, or whole numbers or quadratics or exponents each of these require you to perform operations and to solve the problem. When you succeed, it feels great, when you don’t succeed you find out why because of the detailed explanation of each and every problem. It is a constant application to have on every phone I’ve had for about eight years. It’s just good practice to stay sharp.