# How to do properties of addition

Associative, Commutative, and Distributive Properties

Basic Properties Other Properties. There are three basic properties of numbers, and your textbook will probably have just a little section on these properties, somewhere near the beginning of the course, and then you'll probably never see them how to check your hormone levels until the beginning of the next course. My what is nasa doing after the space shuttle is that covering these properties is a holdover from the "New Math" fiasco of the s.

While the topic will start to become relevant in matrix algebra and calculus and become amazingly important in advanced math, a couple years after calculusthey really don't matter a whole lot now. Basic Number Properties. Why not? Because every math system you've ever worked with has obeyed these properties! Which is why the properties probably seem somewhat pointless to you. Don't worry about their "relevance" for now; just make sure you can keep the properties straight so you can pass the next test.

The lesson below explains how I keep track of the properties. The Distributive Property is easy to remember, if you recall that "multiplication distributes over addition". Any time they refer in a problem to using the Distributive Property, they want you to take something through the parentheses or factor something out ; any time a computation depends on multiplying through a parentheses or factoring something outthey want you to say that the computation used the Distributive Property.

Since they distributed through the parentheses, this is true by the Distributive Property. The Distributive Property either takes something through a parentheses or else factors something out. Since there aren't any parentheses to go into, you must need to factor out of.

Then the answer is:. What gives? This is one of those times when it's best to be flexible. In the latter case, it's easy to see that the Distributive Property applies, because you're still adding; you're just adding a negative. The other two properties come in two versions each: one for addition and the other for multiplication.

Yes, the Distributive Property refers to both addition and multiplication, too, but it refers to both of the operations within just the one rule.

The word "associative" comes from "associate" or "group"; the Associative Property is the rule that refers to grouping. Any time they refer to the Associative Property, they want you to regroup things; any time a computation depends on things being regrouped, they want you to say that the computation uses the Associative Property.

They want me to regroup things, not simplify things. In other words, they do not want me to say " 6 x ". They want to see me do the following regrouping:. In this case, they do want me to simplify, but I have to say why it's okay to do Here's how this works:. Since all they did was regroup things, this is true by the Associative Property.

The word "commutative" comes from "commute" or "move around", so the Commutative Property is the one that refers to moving stuff around. Any time they refer to the Commutative Property, they want you to move stuff around; any time a computation depends on moving stuff around, they want you to say that the computation uses the Commutative Property.

They want me to move stuff around, not simplify. In other words, my answer should not be " 12 x "; the answer instead can be any two of the following:. Since all they did was move stuff around they didn't regroupthis statement is true by the Commutative Property.

I'm going to do the exact same algebra I've always done, but now I have to give the name of the property that says its okay for me to take each step. The answer looks like this:. The only fiddly part was moving the " — 5 b " from the middle of the expression in the first line of my working above to the end of the expression in the second line.

Just don't lose that minus sign! I'll do the exact same steps I've always done. The only difference now is that I'll be writing down the reasons for each step. Page 1 Page 2. All right reserved. Web Design by. Skip to main content. Purplemath There are three how to connect power amp to mixer properties of numbers, and your textbook will probably have just a little section on these properties, somewhere near the beginning of the course, and then you'll probably never see them again until the beginning of the next course.

The identity property of addition says that when 0 is added to a number the answer is the same number. Nothing changes. So, adding 0 to a number is adding nothing to it. The commutative property of addition says that when the order of the addends is changed, the answer still stays the same. Tip: The word commutative is kind of like the word commute, which means to move around. So, think of the commutative property as the rule of moving around the addends.

Yes, their sums are the same even if the order of their addends are different. So, even if we move the addends around, the sum will not change. What do you think is the sum of this equation? It's ! Just like the sum of the other equation. That's because of the commutative property of addition. The associative property of addition says that when three or more numbers are added, the sum is the same no matter which two addends you add first.

In math, parentheses are used show which operations to do first. The associative property shows that the sum for this equation Let's try to check how these equations were solved.

Look at these two equations. Here's another equation That's right! Associative Property The associative property of addition says that when three or more numbers are added, the sum is the same no matter which two addends you add first. Here's another example. Is it also ? Watch and Learn You can now try practice! Start a 7 day free trial.

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