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Math Help - how to add/subtract/divide halfs

  1. #1
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    how to add/subtract/divide halfs

    hi, how can i learn to add/subtract/divide and multiply half's number?

    for instance,

    1/4 + 3/5

    or

    2/5+ 6


    1.5+ 2/5

    etc.etc.etc.

    thanks!
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  2. #2
    MHF Contributor
    Joined
    Mar 2007
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    1,240

    Talking

    Quote Originally Posted by lambofgod View Post
    hi, how can i learn to add/subtract/divide and multiply half's number?
    To learn, study some lessons!

    . . . . .Google results for "multiplying fractions"

    . . . . .Google results for "dividing fractions"

    . . . . .Google results for "adding fractions"

    Have fun!
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  3. #3
    Member
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    earth
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    [quote=lambofgod;287584]hi, how can i learn to add/subtract/divide and multiply half's number?

    for instance,

    1/4 + 3/5

    or

    2/5+ 6


    1.5+ 2/5

    etc.etc.etc.


    you need to change decimals to fractions, mixed fractions to improper fractions.
    ex.
    1/4 + 3/5

    in this case you should get the lcd. (20)

    then, then divide 4 by 20 then multiply by 1
    then, divide 5 by 20 and multiply by 3

    5/20+12/20 then you can add now

    17/20

    in the second one,
    1.5+ 2/5

    change 1.5 to fraction that is 1 1/2 or 3/2

    3/2 +2/5

    the lcd is 10

    10 divided by 2 times 3 is 15
    10 divided by 5 times 2 is 4

    15/10+4/10

    19/10 or 1 9/10
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