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    Math homework.... Help!

    I had a seizure several years ago that perminnately affect the part of my brian that deals with math... I had a terrible time helping my daughter with math homework. If she brings her textbook home I can reteach myself. But I do not retian the information.


    She is multiplying decimals...


    example:


       8.0


    x0.02


     


    Help me please!

    +2  Views: 715 Answers: 6 Posted: 12 years ago

    6 Answers

    0.16.. only for you jenn...

    Jenn

    Why? I have alot of these to teach her...

    Get the line up as if there were no decimal.... How do I know where to put the decimal....

    I swear I am not stupid....
    patann39

    you're right daren1
    daren1

    it's determined by how many digets follow after the decimal point....

    8.0
    x0.02
    0.160 three digets drop the zero cause it's a non factor..
    Jenn

    The answer has the same amont of decimal places as the original 2 numbers???? I think that is right....
    so...
    0.05 x 0.4= .020 or .200
    Jenn

    Have I told you lately that I LOVE YOU!!!!
    daren1

    the answer would have to include all the decimal points so no 0.020 would not be the same as .200 think of it in terms of pennies .20 (twenty cents) would not be the same as .02 (two cents)...p's' i love you too..







    Jenn

    LOL yes I know that .20 and .02 are not the same... But you did make me smile with your comment.. You still love me even if you do think I am simple!!! LOL
    Which would be correct?
    daren1

    yes i luv ya..so much i'm sending you a calulator for christmass..

    Decimal multiplication is always a cumbersome job.


    But it is very easy to deal with such kind of decimal format [specially zero's format with monomial one]


    Proceed as follows:


    1. First multiply the numbers only


    2. Notice the decimal point


    3. Then, move number of decimal point to the result in "1" backward and you will get your required result


    If we see the above problem,


    First multiply 8 with 2, then result would be 16


    Notice the decimal point, then move 2 steps backward,


    then result would be 0.16.


     Now you can recall all those information yourself and teach your daughter efficiently.

    Too long ago for me, Jenn. I'm old enough I don't have to know this kind of stuff unless it's a personal emergency....

    Jenn

    LOL...I teach this stuff every day. But I have to see a problem worked out to retrain myself...EVERYDAY!

    HI    EVERY NUMBER HAS A DECIMAL POINT AS ITS CALLED


    EXAMPLE       1  OR 2 OR 3         SHOULD BE WRITTEN AS   1.0 OR 2.0  OR 3.0  45.0 ETC


    THIS IS  NUMBERS TO ONE DECIMAL POINT WHEN THEY ARE WRITTEN AS    1.00 OR 2.00 OR 3.00   OR 45.00   THIS IS CALLED TWO DECIMAL POINTS AND MAKES THE NUMBER MORE ACCURATE SO THE MORE DECIMAL POINTS THE MORE ACCURATE THE NUMBER


    DECIMAL POINT MEANS 10 PLACES     SO IF YOU    TAKE NUMBER 1.0  AND YOU MOVE THE DECIMAL POINT TO THE RIGHT    IT BECOMES   10.0     OR  NUMBER 5.0 AND DO THE SAME


    THAT BECOMES   50.0      IF YOU DO THE SAME AGAIN      10.0  BECOMES   100.0    AND  50.0  BECOMES  500.0  AND SO ON


    WHEN YOU GET TO NUMBERS LESS THAN  1  ONE    THE REVERSE HAPPENS


    IF YOU   WRITE THE NUMBER 1.0     AS 0.1     THIS MEANS   IT IS ONE TENTH  OR 1/10


    0.2   = 2/10     0.3=3/10  ETC          


    IF YOU MOVE THE DECIMAL POINT TO THE LEFT  ONE MORE PLACE   LIKE THIS  0.001  OR 0.002   THIS MEANS     1/100   OR  2/100   


    THEREFORE YOUR QUESTION      8X0.02    =    8 X 2/100      =   16/100  =  0.16


    FROM ABOVE 0.10   =1/100       THEREFORE    16/100      =0.10X16   =0.16

    I used to be good at this stuff...

    Jenn if I see you saying you are dumb one more time I am going to put you over my knee and spank you. Don`t get excited I am only joking.


    Zenius is ,merely multiply the numbers as you would and other multiplcation then place a decimal point distanced from the right hand side of the answer the number of spaces that the largest decimal point in your original sum. 


    That is 6.09x5.078= 30.925 ie 3 decimal places back

    Jenn

    LOL.. I am brilliant!!!!
    PEOPLELOVER

    You sure are Jenn that is why we all love you. any that don`t are dills.


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