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Math Help - i need some help on decimal?anyone???

  1. #1
    Newbie
    Joined
    Jul 2008
    Posts
    15

    Smile i need some help on decimal?anyone???

    I need help on these problems:
    #35. 57.116x100
    estimate:
    exact:
    #36. .094x1000
    estimate:
    exact:
    #37. 1.62 divide 10
    estimate:
    exact:
    #38. 24.03 divide 100
    estimate:
    exact:

    can anyone help it will be greatly appreciated!! thanks to all that try!!
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  2. #2
    MHF Contributor kalagota's Avatar
    Joined
    Oct 2007
    From
    Taguig City, Philippines
    Posts
    1,026
    HI!.

    when you multiply (positive)powers of 10 (that is 10, 100, 1000,...) on a certain number, you just need to move the decimal point to the right. the number of movement is equal to the number of zeros.


    example: 245 x 10
    you can write 245 with the decimal point right? 245 is also 245. or 245.00 (etc.)
    that means, since 10 has 1 zero, you will move the decimal point once to the right which gives you 245 x 10 = 2450.

    example: 3.14159265 x 1000
    1000 has 3 zeros, therefore, you will move the decimal point three times. so 3.14159265 x 1000 = 3141.59265

    get it already?

    for division, instead of moving to the right, you will move it to the left.

    example: 2.1532 divide by 100
    since 100 has to zeros, move the decimal point twice to the left. so 2.1532 divide by 100 gives you .021532

    NOTE: you can always write a number by adding zeros to the right most or to the left most of the number but not in between the digits of the number.
    example: 20.23 is the same as 20.23000000 also the same as 00020.23 and also as 00020.2300000
    but it is not the same as 20.002300 and 2000.2300..
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