I give up on this math stuff. Using the associative property?

Question

of addition to write an expression that is equivalent to the following expression. (9+20)+19
Um - what???
Does anyone know how to do that?

Answer 1

Yes. Basically, "associative" means that the numbers can "associate" with others.

For addition, it doesn't matter in what order you add the numbers. Therefore, 20 can "associate" with either 9 or 19.

So one possible answer would be
9 +(20 +19)

Another
(9 + 19) +20

If you add the numbers together, you get the same answer, no matter which numbers you group (or associate) together.

This comes in handy when you're trying to add long strings of numbers, such as 8+7+9+2+10+1+3. Rather than adding the numbers together in that order, you can use the associative property to group them in 10's: (8+2)+(7+3)+(9+1)+10=40

Answer 2

Math is actually really simple because once you know the easier steps, the harder ones get easier. The associative property is where you can change the parentheses and end up with the same answer. So if you moved the parentheses from 9+20 to 20+19, it would equal the same thing.



(9+20) +19= 9+(20+19)


good luck with math!
~ <3

Answer 3

You should do your own homework, but I will help.

The associative property means it does not matter how you group the operations. It does not matter if you add 9 and 20 first and then add 19 to that sum or if you add 20+ 19 and then add 9 to that sum, you get the same answer of 48.

(9+20) + 19 = 9 + (20+19) (Your answer is in there)

Division is not associative.
(20 / 10) / 2 = 1
20 / (10 / 2) = 4

Answer 4

9+(20+19)

Answer 5

Yep - 9+(20+19). What it means is that you can add numbers in any order. Like, you could add the 9 and the 20 first, total that, then add 19 or you could add the 20 and the 19 first, total that, then add the nine. Doesn't sound like a big deal but it is because many things in life don't work like that, where order doesn't matter. It is a luxury (strange word to describe it, I know) to be able to do that in addition.

Answer 6

(9 + 19) + 20 =
(9 + 20) + 19 =
(19 + 9) + 20 =
(19 + 20) + 9 =
(20 + 9) + 19 =
(20 + 19) + 9 =
(9 + 19 + 20) =
9 + (20 + 19) = etc....

Answer 7

(9+20)+19=9+(20+19)

In Mathematics an operator (here '+') has associativity if the position of the parenthesis does not matter.

Addition and multiplication are associative operators
But subtraction and division are not
2-(4-5) = 3 which is not equal to (2-4)-5 = -7

Answer 8

yea, all u do is move the ( )....keep evrything else the same!