Math help

[buzzlady]

(84 - 26) - 40 - (16 - 23) = 25

96 - (10 - 29 - 2) = 117

DS is working with substrcting negative numbers. It's been awhile since I worked with negative numbers. I just wanted to confirm that the above problems are correct. Now to try to explain it to DS.

 

[tmq2766]

I got the same answers.

 

[kpgclark]

I won't tell you here, but at least one answer is wrong. You have two options to do the problem:

1. Do everything in the ( ) first then perform the operation in front of the ( )

2. Change the signs of the numbers where indicated THROUGH the ( ).

For example if you have

5 - (3 - 2) =

By using the first way you would have

5 - (1) = 4

By the second way you'd have

5 - 3 + 2 = 4

Hope this helps!

 

[Cindy B]

Yes remember the order of operations PEMDAS

Parentheses

Exponents

Multiplications

Adding

Subtracting

Yes, I got different answers as well for a problem.

 

[izzy]

Originally posted by tmq2766
I got the same answers.

Me, too.

 

[Annette_VA]

Originally posted by Cindy B
Yes remember the order of operations PEMDAS

Parentheses

Exponents

Multiplications

Adding

Subtracting

Yes, I got different answers as well for a problem.

"Please Excuse My Dear Aunt Sally"... Oh, the things that get stuck in our brains...

 

[littleclover]

Originally posted by kpgclark
I won't tell you here, but at least one answer is wrong. You have two options to do the problem:

I have the same answers as the op. Which one do you feel is incorrect?

 

[tmq2766]

Boy do I feel stupid!!!!!!!

 

[Nette]

Agreed... one of those is incorrect.

 

[littleclover]

I put the problems in an Excel worksheet and received the same answers as the op?

 

[momsully]

I got the same answers as the op. I also put the problems in Excel and got the same answers.

 

[crazelion]

(84 - 26) - 40 - (16 - 23) = 25

96 - (10 - 29 - 2) = 117


Put the problem in my TI-86 cacualtor and got the same answers that you did.

 

[Cindy B]

Please don't rely on machines, this is something you need to do pencil and paper. Does Excel truly take notice of the negative number?

 

[kpgclark]

Oops, sorry. They both are right.

 

[IceQueen777]

The OP's answers are correct.

 

[buzzlady]

Thanks everyone. I was relying on the use of my paper, pencil and an old memory.

 

[Cindy B]

I got a different answer for number one.. I may have written a digit wrong.

I'll check it and come back.

 

[Fishbone†]

I got the same as the OP as well...... can someone explain which one is wrong and why??

 

[Miss Jasmine]

I got the same answers. UGH I hate math.

 

[Beth76]

I got the same answers using a graphing calculator AND pencil/paper. Will someone who's getting different answers please explain. Maybe I'm forgetting something about negatives (it HAS been awhile).