Subtraction & Addition Adding and Subtracting  A+ Math   Play math games like concentration or test your skills with online flashcards from addition to algebra. This is a helpful site no matter what your math level. It’s great practice before a quiz or test to keep your math skills sharp.  Spacey Math   Help the space ship regenerate fuel! Answer math questions in addition, subtraction, multiplication, and division to get the spaceship more fuel to get home.  Teach R Kids Math   Teach R Kids Math has been designed by children and adults.