Why 5+5+5 = 15 "IS WRONG"

[KeepingItReal]

Why "5+5+5=15" is wrong under the Common Core - Business Insider (http://www.businessinsider.com/why-55515-is-wrong-under-the-common-core-2015-10)

[Patty55]

Ah Yes, "THE NEW MATH" circa 1960's. Operating on different bases.

Another one from back in the day, when is 1 + 1 not equal two? (hint this is not the new math)

[l2ridehd]

Ah Yes, "THE NEW MATH" circa 1960's. Operating on different bases.

Another one from back in the day, when is 1 + 1 not equal two? (hint this is not the new math)

Yes, it equals 3 in Bolean Algebra which is the math that all computers use.

[dirtbanker]

A businessman was interviewing job applications for the position of manager of a large division. He quickly devised a test for choosing the most suitable candidate. He simply asked each applicant this question, "What is two plus two?"
The first interviewee was a journalist. His answer was, "Twenty-two".
The second was a social worker. She said, "I don't know the answer but I'm very glad that we had the opportunity to discuss it."
The third applicant was an engineer. He pulled out a slide rule and came up with an answer "somewhere between 3.999 and 4.001."
Next came an attorney. He stated that "in the case of Jenkins vs. the Department of the Treasury, two plus two was proven to be four."
Finally, the businessman interviewed an accountant. When he asked him what two plus two was, the accountant got up from his chair, went over to the door, closed it, came back and sat down. Leaning across the desk, he said in a low voice, "How much do you want it to be?" He got the job.

[tomwed]

A businessman was interviewing job applications for the position of manager of a large division. He quickly devised a test for choosing the most suitable candidate. He simply asked each applicant this question, "What is two plus two?"
The first interviewee was a journalist. His answer was, "Twenty-two".
The second was a social worker. She said, "I don't know the answer but I'm very glad that we had the opportunity to discuss it."
The third applicant was an engineer. He pulled out a slide rule and came up with an answer "somewhere between 3.999 and 4.001."
Next came an attorney. He stated that "in the case of Jenkins vs. the Department of the Treasury, two plus two was proven to be four."
Finally, the businessman interviewed an accountant. When he asked him what two plus two was, the accountant got up from his chair, went over to the door, closed it, came back and sat down. Leaning across the desk, he said in a low voice, "How much do you want it to be?" He got the job.
That's a great story/joke.

[Patty55]

I think the new math was great to open up your mind. I can just visualize some pothead counting his fingers and thinking how different it would be if we had seven instead of ten.

[DonH57]

I think the new math was great to open up your mind. I can just visualize some pothead counting his fingers and thinking how different it would be if we had seven instead of ten.

Let's see. One, two, tree, four, five, six, ................ Yep. I still count ten!:MOJE_whot:

[tuccillo]

Actually it equals 10 in binary.

Yes, it equals 3 in Bolean Algebra which is the math that all computers use.

[Jima64]

By my brain it is 15. If I shop and see three items costing 5 each, it is 15 to me.

[tomwed]

I like the old math III + III + III + III + III= XV. [I guess I'm dating myself]

[ajbrown]

Yes, it equals 3 in Bolean Algebra which is the math that all computers use.

I actually thought the answer was 1 in Boolean algebra, but admittedly I did not spend much of my life designing circuits.

[tomwed]

In Binary you have zero or one. So 01 + 01 = 10 You would call this one zero base two. There are only two numbers.

In the decimal system you have zero to nine. So 01 + 09 = 10 We call this ten but it would also be correct to call it one zero base ten. In the decimal system there are ten numbers.

That should clear it up.

ps Don't get me started on the hexadecimal number system or we'll be here all night.

[ajbrown]

In Binary you have zero or one. So 01 + 01 = 10 You would call this one zero base two. There are only two numbers.

In the decimal system you have zero to nine. So 01 + 09 = 10 We call this ten but it would also be correct to call it one zero base ten. In the decimal system there are ten numbers.

That should clear it up.

ps Don't get me started on the hexadecimal number system or we'll be here all night.

All true, except the binary number system is not the same as Boolean Algebra.

BTW, I used hexadecimal to keep my birthday until I turned 3A. Now it just sounds funny..

[Patty55]

WHOA, who knew there were so many members of Geeks R Us?

I confess, I was on the Math Team-we didn't have cheerleaders.:shocked:

[tomwed]

Did you hear about the constipated mathematician? He worked it out with a pencil.
[clearly i'm back peddling until tomorrow]