What is Arithmetic Four?
This activity allows two users to play a game where each player tries to connect four game pieces in a row before his or her opponent does. The players can choose to answer problems involving whole number and integer addition, subtraction, multiplication, and division. They can also choose the difficulty level.
When adding or subtracting integers, consider the number line. The minus sign is always a negation of the positive direction, whether the minus sign represents the operation of subtraction or the sign on the integer. For example take the addition problem 5 + -7 = -2.