0+50*1-60-60*0+10=?

[Agschmid]

Have at it DU...

http://cheezburger.com/8461001984/funny-facebook-fails-math-order-of-operations

[Lochloosa]

1. 10

[NRaleighLiberal]

2. 10

[Agschmid]

5. So sure...

[rocktivity]

8. The calculator is putting in its own parentheses

Suppose (0+50) x (1 - 60) - 60 x (0 +10) was intended?


rocktivity

[pinboy3niner]

3. As someone once said...

[Lochloosa]

4. ...

0+50=50
*1=50
-60=-10
--10-60=-70
-70*0=0
0+10=10

Ok. Tried to do that on my phone. The key is *0. Always 0

[Dr. Strange]

6. I got nothing.

0+50*1-60-60*0+10 = 0 + 50 - 60 - 0 + 10 = 0

[petronius]

9. Yup. And I just noticed a thread in GD bemoaning how bad the Millennials are

at math - if this thread goes the way past similar threads have gone, and if the DU demographics really are as Boomer- and Xer-skewed as past polls indicate, then I think the Millennials among us are about to end up with a bit of a rebuttal argument (albeit a tu quoque)...

[Agschmid]

15. You caught me...

[rocktivity]

7. 10 -- with no parentheses you do the math from left to right

reading it as if were prose.


rocktivity

[stevenleser]

10. The answer is -20

Last edited Sat Mar 14, 2015, 02:09 AM - Edit history (1)

Results after each operation in order of pemdas: parentheses, then exponents then multiplication then division then addition and then subtraction.

After multiplying: 0+50-60-0+10

After adding: 50-60-10

After subtracting: -20

[jakeXT]

14. The minus sign before the 0 is meaningless

You would change the sign with a parentheses and something like this -1(+10), because there is an invisible multiplication sign after -1.

Try this one

0+50-60-1+10

[NutmegYankee]

11. 0.

If you do the multiplication first as you should.

[CBGLuthier]

12. 0, if you follow the long established rules. Any number you like if you just want to pull something

out of your ass.

But if you want to feel superior there is the story floating around about the Indian bride who asked her prospective husband, at the altar, how much 15+6 was. She had been told he had an education. He said 17 and she walked away.

[Optical.Catalyst]

13. I got 4:20

What time you got?

[Inkfreak]

27. ....

[Scuba]

16. My Dear Aunt Sally knows this one!

[femmocrat]

17. What does the asterisk mean?

Is that a math symbol?

[Ptah]

18. The asterisk means multiply

[femmocrat]

19. I thought multiply was an "X"

When did they change it? LOL

<---me

[Dont call me Shirley]

21. It has been used for at least 10 years. My child was using the asterisk in elementary school.

I had to ask "what is that, what does that mean?". Multiply is the answer. The math curriculum used is called Everday Math. It changed the whole concept of math instruction, and not for the better either.

[femmocrat]

33. Thanks!

I haven't kept up on the changes in the math curriculum, but I have read complaints about the latest "new" math.

[muriel_volestrangler]

37. Computing has used the asterisk for multiplying since the 50s

Using the actual letter 'x' would cause problems with how programs are interpreted by a machine, and few keyboards have ever had a separate diagonal cross sign (similarly, the 'obelus' - '÷' - doesn't appear on most keyboards, so '/' is used for division). So it looks like computing is now influencing how basic written maths is taught.

[Dont call me Shirley]

38. Thanks. That explains a lot.

[SwissTony]

43. I'll expand a fraction on what muriel said

All computer languages (as far as i know) use variables. These have names such as "length" or "profit" which in themselves have some degree of self-explanation. But you can also have variables called "x" and "y". These would be useful if you were writing a program for, say, solving pythagorean/geometric problems. So, reserving "x" as the symbol for multiplication would essentially cut a whole in the alphabet. For example, how would a program interpret a variable called "xray"? In certain circumstances, a desirable variable name, but if "x" was reserved, this could cause problems.

[magical thyme]

20. everything up the the second 0 is irrelevent

since as soon as you multiply it times 0 you get 0.

0 + 10 = 10.

So I'm going with 10.

[handmade34]

22. =

Parenthesis
Exponents
multiply
divide
add
subtract

[magical thyme]

24. oh. In that case, 0.

[handmade34]

31. ...

[steve2470]

23. 10, but it's been decades since I took any math

This is why I didn't become a mathematician/engineer/scientist/other heavy math profession.

eta: In my defense, I was NEVER taught order of operations. Sucky education, I haz.

eta: Zero, not 10.

[SwissTony]

42. Steve, the order is pretty important and most people can see it if you give them a concrete example

Suppose you lent me 50 bucks and it's time for me to pay you back.

I give you a two dollar note and three 10s and claim that's 50 bucks because

2 + 3 * 10 = 5 * 10 = 50.

Would you accept that reasoning? Nah, you'd kick me in the goolies. In this situation, you can see the multiplication has to be done first.

i'm the first to admit it's harder to see in an abstract situation such as the original question. But the rule is do multiplications and divisions first, then additions and subtractions.

[A Simple Game]

44. Excellent example. n/t

[Make7]

25. "No I just have a master electrical license where I'll i do all day is math."

[One_Life_To_Give]

26. Billy Preston

[azurnoir]

34. yep you got that right

[From The Ashes]

28. A headache...

...mostly.

[Agschmid]

30. Yup!

[Tuesday Afternoon]

29. don't ask me, I got nothing.

[Worried senior]

32. There is no way I could

solve this problem.

I don't even understand the examples.

[Sweet Freedom]

35. I get zero

but I was never good at math.

[muriel_volestrangler]

36. Why does that page claim people are 'guessing' 0?

It is, as far as I'm concerned, the correct answer, and they worked it out.

[seveneyes]

39. 25 or 6 2 4

maybe ten of one or half a dozen times 2 minus 2

[Yavin4]

40. It's zero

Multiplication is the highest order here:

0+50-60+10
-10 + 10 =0

[SwissTony]

41. Yep, do the multiplications (and divisions first)

0+50*1-60-60*0+10
= 0 + 50 - 60 - 0 +10
= 0