Operations of Signed Numbers/Integers (rules with add/sub/mult/div)
Addition & Subtraction
 Same (like) signs ADD and KEEP that sign.
 Different (unlike) signs SUBTRACT and KEEP sign of the larger absolute value.
Examples:
Same sign. Add and keep the sign.
Different signs. Subtract and keep the sign of the larger absolute value.
Different signs. Subtract and keep the sign of the larger absolute value.
Same signs. Add keep the sign.
Multiplication and Division of Integers
 Multiply or divide, if the signs are same (like) the sign of the product or quotient will be positive.
 Multiply or divide, if the signs are different (unlike) the sign of the product or quotient will be negative.
Examples:
Same signs. The sign is positive.
Same signs. The sign is positive.
Different signs. The sign is negative
Same signs. The sign is positive.
Different signs. The sign is negative
Same signs. The sign is positive.
Watch the Video: Adding/Subtracting negative numbers by Kahn Academy
