Contributor: Briana Pincherri. Lesson ID: 11201
What's so amazing about addition? 2 + 2 = 4, right? Add some negative signs to the numbers, then see what you get. What if they are mixed up, positive and negative? Videos and games add up to AMAZING!
Chances are 2 + 2 is one of the first addition problems you learned.
This lesson is a reminder of just that.
Every single day, we have the opportunity to add things together.
Whether you are trying to decide the total amount of something you have, or how many of something you need, chances are that addition is involved. Because of this, it is a skill we are generally pretty good at!
However, the one area we often need to review is dealing with positive and negative sign rules.
This lesson focuses on positive and negative sign rules, so by the end you can declare that you are AMAZING at all types of ADDITION.
Let's get started!
Sign Rules for Addition
positive + positive = positive (add numbers, keep sign positive)
negative + negative = negative (just add the numbers, bring along the negative sign)
negative + positive = ? (ignore the signs and SUBTRACT the numbers [largest - smallest] and keep the sign of the "bigger" number)
Let's take a look at some specific examples.
positive + positive
Add the numbers, and keep them positive.
negative + negative
Add the numbers, and keep them negative.
different signs (negative + positive or positive + negative)
These problems take just a little bit of extra work but really aren't too bad. They actually end up just becoming subtraction problems!
Here are the rules.
Take a few minutes to watch the video below for plenty of examples showing these steps.
When you are ready, you can jump to the Got It? section to try some problems on your own.