Basic math.. Who knows it?

k0nfyo0zed
k0nfyo0zed Posts: 313 Member
in Chit-Chat
basicmath.jpg

Please restore my faith in humanity...

I know the thing says "comment with your answer only" but I would like that to say "show your work!"

Remember elementary and middle school?

(i apologize if i have brought back repressed memories of creepy math teachers)

(big hint: the answer is not 0, 1 or 3... or 9 or 12!) here's why:


AFTER 6 PAGES I'M EDITING TO ADD THIS IN... SPOILERS? :)

PEMDAS is the order of operations. parentheses, exponents, multiplication, division, addition and subtraction.

so, you do the multiplication first 5x0=0

that makes the problem 9-5+3.

when you get to addition and subtraction you work the problem left to right, 9-5 = 4. then 4+3 = 7.

IF you chose to do addition first, you need to be sure to take the symbol in front of the number with it, thus making the problem 9+ (-5) + 3 which, is still 7.

it's not 0 because the whole equation isn't multiplied by 0, only 5. for it to be zero it would have to read (9-5+5-3) x 0

it's not 1, because when you do the addition first, it's not 5+3, it's -5+3 which is -2, and 9 + (-2) is 7.

it's not 3, because you don't do the problem left to right, you have to do the multiplication first. for the answer to be three it would have to read (9-5+5) x 0 + 3

it's not 9 because you can't cancel out the -5+5 without doing the multiplication first.

and answers of 7 make me happy. :)

(clear?)
«1345678

Replies

  • _snw_
    _snw_ Posts: 1,298 Member
    7.

    My Dear Aunt Sally!!! <--- that's showing my work.
  • kidakiwi04
    kidakiwi04 Posts: 238
    According to my calculations the answer is 7...... but I hate Hate HATE math. :grumble: :grumble: :grumble:

    Runs and hides in my english books LOL
  • IronmanPanda
    IronmanPanda Posts: 2,083 Member
    donut.
  • k0nfyo0zed
    k0nfyo0zed Posts: 313 Member
    the answers i've seen for this problem are: 0, 1, 3, 7, 9 and 12.

    i cringe.
  • Trail_Addict
    Trail_Addict Posts: 1,340 Member
    7
  • lizard053
    lizard053 Posts: 2,344 Member
    basicmath.jpg

    Please restore my faith in humanity...

    I know the thing says "comment with your answer only" but I would like that to say "show your work!"

    Remember elementary and middle school?

    (i apologize if i have brought back repressed memories of creepy math teachers)
    If I remember the order of operations correctly, multiplication first, then addition, then subtraction, so 1.
  • IronmanPanda
    IronmanPanda Posts: 2,083 Member
    the answers i've seen for this problem are: 0, 1, 3, 7, 9 and 12.

    i cringe.

    Don't forget donut.
  • sllm1
    sllm1 Posts: 2,130 Member
    7
  • k0nfyo0zed
    k0nfyo0zed Posts: 313 Member
    if you are doing addition before subtraction at the 9-5+3 stage, you need to take into consideration that subtracting is just adding a negative. meaning the problem becomes 9 + (-5) + 3
  • AllTehBeers
    AllTehBeers Posts: 5,030 Member
    any thing times 0 is 0.
  • RaeLB
    RaeLB Posts: 1,216 Member
    9-5=4
    +5=9
    x0=0
    +3=3
  • lizard053
    lizard053 Posts: 2,344 Member
    if you are doing addition before subtraction at the 9-5+3 stage, you need to take into consideration that subtracting is just adding a negative. meaning the problem becomes 9 + (-5) + 3

    Now my over-educated brain hurts.
  • k0nfyo0zed
    k0nfyo0zed Posts: 313 Member
    i want to hug everyone answering 7...
  • ironanimal
    ironanimal Posts: 5,922 Member
    3
  • Eaglesfanintn
    Eaglesfanintn Posts: 813 Member
    7 - you have to know your order of operations...at least that's what I'm going with.
  • builtforlife
    builtforlife Posts: 259
    Please Excuse My Dear Aunt Sally. In order: Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction. I only see Subtraction, Multiplication, and Addition. First do the multiplying, then the adding, then the subtracting.
  • paletendril
    paletendril Posts: 24
    7
  • BIGJIMMYU
    BIGJIMMYU Posts: 1,221 Member
    I also get 7.
  • msarazine
    msarazine Posts: 65
    7
  • treetop57
    treetop57 Posts: 1,578 Member
    7

    But "maths" should be "math."

    Thanks for asking!
  • ShalisaClam
    ShalisaClam Posts: 190
    I'm going with 3. So, when do we get the answer, teach?
  • KaleidoscopeEyes1056
    KaleidoscopeEyes1056 Posts: 2,996 Member
    Well, it gives you the answer, it equals ...?
  • acoons1990
    acoons1990 Posts: 28
    i want to hug everyone answering 7...

    This. Any other answer, especially when incorrectly defended, makes me cringe...
  • IronmanPanda
    IronmanPanda Posts: 2,083 Member
    Wait.. not donut... Pizza!
  • TopazCarey
    TopazCarey Posts: 263
    Um, I was gonna say 1.
    But I'm a Journalism major so whatever.
  • SmartAlec03211988
    SmartAlec03211988 Posts: 1,896 Member
    I'm not even going to pretend I know. I have dyscalculia., so math is just about impossible for me to learn, even the easy-peasy stuff.
  • mikey1976
    mikey1976 Posts: 1,005 Member
    i was wrong i had 3 then i cheated and used calculater its 7 o man do i hate math
  • Bahet
    Bahet Posts: 1,254 Member
    Please Excuse My Dear Aunt Sally. In order: Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction. I only see Subtraction, Multiplication, and Addition. First do the multiplying, then the adding, then the subtracting.
    I'm a bit turned on right now. :laugh:

    The answer is 7.
  • k0nfyo0zed
    k0nfyo0zed Posts: 313 Member
    Wait.. not donut... Pizza!

    donuts and pizza are the answer to many things, but not this ;)
  • Elizabeth_C34
    Elizabeth_C34 Posts: 6,376 Member
    Properly grouped, (9-5) + (5x0) + 3 = 4 + 0 + 3 = 7

    People really get this wrong?

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