That is, by plus -ing a minus, you're adding in the other direction. give you a " proper" mathematical explanation of this "the minus of a minus is a plus " rule. add and subtract expressions involving both positive and negative numbers; and use the rules for adding, subtracting, multiplying and dividing them. 2. Two 'pluses' make a plus, two 'minuses' make a plus. A plus and a minus make a minus. Example. 3 + (-2) A plus and a minus make a minus, so this is the same.
Minus minus plus rules - Support steht
Minus minus plus rules Video
Understand and Learn the Rules of Positive and Negative Numbers