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Math Help - simplify each expression

  1. #1
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    simplify each expression

    3 dot 5+3 dot 15

    5 dot 22-5 dot 2
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  2. #2
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    Quote Originally Posted by dianna View Post
    3 dot 5+3 dot 15

    5 dot 22-5 dot 2
    Hello, Dianna,

    a) first multiply, then add:

    3 \cdot 5+3 \cdot 15=15+45=60

    b) first multiply, then subtract:

    5 \cdot 22-5 \cdot 2=110-10=100

    EB
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  3. #3
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    may i ask.. what does the "dot" represent? is it "." ?
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  4. #4
    Bar0n janvdl's Avatar
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    Yes does it mean decimal or multiply?
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  5. #5
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by janvdl View Post
    Yes does it mean decimal or multiply?
    i believe it's multiply, if it was to represent a decimal point she would have just typed "."
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  6. #6
    Bar0n janvdl's Avatar
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    You never know.
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  7. #7
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    Quote Originally Posted by dianna View Post
    3 dot 5+3 dot 15

    5 dot 22-5 dot 2
    3 dot 5+3 dot 15=6 dot 65
    5 dot 22-5 dot 2=0 dot 02
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  8. #8
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by lancemaria View Post
    3 dot 5+3 dot 15=6 dot 65
    5 dot 22-5 dot 2=0 dot 02
    we still are not sure what dianna was using the dots to mean. if she meant multiply, earboth is correct, if she meant decimal points, then you are correct...only time will tell it seems
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  9. #9
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    Smile hello

    hi all,
    earboth you right.
    I think , and maybe all that dot or period in math part that would be meant as multiply.
    3 dot 5+3 dot 15
    or
    3(5) + 3(15) = 60

    5 dot 22-5 dot 2
    or
    5(22) - 5(2) = 100

    First you perform multiplication before you can add, as MDAS
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  10. #10
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    Quote Originally Posted by lancemaria View Post
    First you perform multiplication before you can add, as MDAS
    I'm assuming you're using MDAS to represent the order in which you must process an equation?
    M - Multiply
    D - Divide
    A - Addition
    S - Subtraction

    It should, in fact, be Divide first and then Multiply; ie, DMAS

    Apologies if I have mis-understood you.

    Personally, I was taught to use BODMAS, which is why I recognised this.
    B - Brackets
    O - pOwers
    D - Divide
    M - Multiply
    A - Addition
    S - Subtraction
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  11. #11
    Grand Panjandrum
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    Quote Originally Posted by kwah View Post
    I'm assuming you're using MDAS to represent the order in which you must process an equation?
    M - Multiply
    D - Divide
    A - Addition
    S - Subtraction

    It should, in fact, be Divide first and then Multiply; ie, DMAS

    Apologies if I have mis-understood you.

    Personally, I was taught to use BODMAS, which is why I recognised this.
    B - Brackets
    O - pOwers
    D - Divide
    M - Multiply
    A - Addition
    S - Subtraction
    Nice mnemonic but the precedence of multiply/divide and addition/subtraction
    pairs is the same in the usual conventions.

    RonL
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  12. #12
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    Quote Originally Posted by CaptainBlack View Post
    Nice mnemonic but the precedence of multiply/divide and addition/subtraction
    pairs is the same in the usual conventions.

    RonL
    Yeah, I accept that its only a very trivial point, but thought I should point it out in case lancemaria (or anybody, as a matter of fact) have been learning it incorrectly.
    I know from experience that simple trivialities, such as this, can be very irritating when you are unable to find out where you have gone wrong.
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  13. #13
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    Thumbs up Order of Operations

    I was taught PEMDAS


    Parentheses
    Exponents
    Multiply (left to right)
    Divide (left to right)
    Add (left to right)
    Subtract (left to right)


    I remember it by "Please Exuse My Dear Aunt Sally"
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  14. #14
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    i hope that the 'dot' means '.' ....
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  15. #15
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    i guess she means multiply by writing it as "dot"

    O_o'
    Last edited by Saleha; May 13th 2008 at 02:25 AM.
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