Nope.
No it isn't.
I'm not putting anything in at all, no brackets from me. You are putting a plus sign before the minus sign. You are changing 100 - 10 + 10 to 100 +-10 + 10. You cannot successfully argue with that fact.
Oh bless.
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6 - 1 x 0 + 2 / 2 =
- Thread starter Bozza
- Start date
I have a masters in mathematics. I am telling you for a FACT, you are wrong.
This has now gone WAY off topic. Triggar didn't invent the 100-10+10 example. It has been used to demonstrate that it's important to UNDERSTAND the functions being performed. Anyone who doesn't get the answer 7 from the thread title is not understanding the question, or the functions they are then performing.
By introducing the concept of negative numbers to people who think 5x0=5 is not the help they need!
Don Quixote
Well-known member
- Nov 4, 2008
- 8,362
[MENTION=11992]HseagullsH[/MENTION] is a maths wizard, he'll tell you all the answer.
While you would get the correct answers, and no damage to your masters, you are getting the correct answers by adding a plus sign before your minus sign.
This is a real equation:
10 times negative 10. The answer is -100.
This is not a real equation:
10 negative 10.
You need an operation between your numbers. Of course this will work when you treat the 10 as a negative and add a plus operation before it, but you need to recognise that you are adding that operation.
Quite.
You might be right there! Maths may as well be a foreign language to some people, but as a fluent speaker it is incredibly frustrating seeing people get what are to me such basic things wrong. I'll leave them to it before i make myself look a fool!
Call me a cynic, but I doubt you are old enough to have a masters in mathematics. But, I know I've got an a-level in maths, and a bachelor's degree that included a couple of maths courses, and in none of them was I ever taught that x-y should be worked out as x + -y. Of course, it is equivalent, but it was never taught as a calculation method.
But as someone else has pointed out, the 100 -10 + 10 = 80 was introduced by someone earlier in the thread to highlight how getting 5 on the title equation after multiplication and division (6-0+1) was wrong, and that to wrongly get 80 as a total you need to put the brackets in it as 100-(10+10).
Of course to correctly find the total you do 100-10, then +10.
Masters takes 4 years to attain, starting at 18 a 22 year old can have a masters. The only point i was trying to make is that the order in which you add/subtract does not matter, provide you do it in a correct fashion. The most logical/normal way to do it would be left to right, but if you so choose, can be done in whichever order you like. Perhaps i was being a little pedantic.
Personally I have no reason to doubt it, but it's not really relevant at the level of maths we're discussing. No one doing a master's is going to lose any marks for using either of the methods we're discussing. Unless they're doing a thesis on Bodmas.
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Wouldn't you have to do a graduate course first?
Actually, when using your method, you never do any subtracting do you. You just add negative numbers. If you actually did some subtracting (in the wrong order) maybe you'd hit problems.
Not according to the teachings of the Bodmas god (although I appreciate your method of adding negative numbers works, that's just not Bodmas).
Nothing wrong with being pedantic
All included. 3 years undergrad, 1 year post.
Fair dos.
3 year bsc, 1 year msc, or some universities do a combined 4 year masters course, all at extortiante fee rates of course!
Why do subtraction in the pure sense you mean when you can subconciously do it as addition and never fear getting it wrong?Actually, when using your method, you never do any subtracting do you. You just add negative numbers. If you actually did some subtracting (in the wrong order) maybe you'd hit problems.
Not according to the teachings of the Bodmas god (although I appreciate your method of adding negative numbers works, that's just not Bodmas).
Nothing wrong with being pedantic
Why do subtraction in the pure sense you mean when you can subconciously do it as addition and never fear getting it wrong?
What do you do if it's 100 -(minus) -(negative)10? 100 plus negative negative 10?
cyrilthesinik
New member
- Oct 15, 2011
- 185
So what is the correct answer
I know we got 3 points tonight and we were f@[MENTION=19866]king B[/MENTION]rilliant! but after many pints and a double J.D this all makes my head spin??
I know we got 3 points tonight and we were f@[MENTION=19866]king B[/MENTION]rilliant! but after many pints and a double J.D this all makes my head spin??
SeagullSongs
And it's all gone quiet..
What do you do if it's 100 -(minus) -(negative)10? 100 plus negative negative 10?
If there are two negatives they simply cancel out to make a positive
I've no problem with that, but that's what you'd need to explain to people. You'd need to say, hey guys, instead of having to worry about the order, just treat all subtractions as negative numbers and stick with additions. Sadly you'd lose half of NSC with that (I think most still think the answer is 1).Why do subtraction in the pure sense you mean when you can subconciously do it as addition and never fear getting it wrong?
But, seeing as we're both pedants... you've realised you were wrong haven't you
If not, could you give me an example of an equation where a subtraction appears to the left of an addition, but you do the addition first and all ends well (and we can use any numbers we want in the equation)?