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Math Help - I feel stupid!

  1. #1
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    I feel stupid!

    My son is having problems with this Math pattern and a math sum

    I was boasting about how good I was as a kid at these, well the old grey matter is clogged up I think

    8,40,20, ? 50,250, ?
    also
    24+(12-1)/10=

    I will kick myself once you tell me. but please help.

    Jim
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  2. #2
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    8,40,20, ? 50,250, ?

    I see the pattern (multiply by 5, cut in half ... repeat).


    24+(12-1)/10=

    24 + (11)/10 =

    24 + 1.1 =

    25.1
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  3. #3
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    Quote Originally Posted by gunner View Post

    8,40,20, ? 50,250, ?
    also
    24+(12-1)/10=
    Mutiply by 5.
    Next step you divide by 2.
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  4. #4
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    Quote Originally Posted by gunner View Post
    24+(12-1)/10
    You have to do this in a particualar order. Remember Bodmas.

    B = Brackets
    O = Others (E.G. Indices)
    D = Division
    M = Multiplication
    A = Addition
    S = Subtraction

    24+\frac{(12-1)}{10}

    Brackets first:

    =24 + \frac{11}{10}

    As there is not other (Indices etc) operation so skip to Division.

    =24 + 1.1

    Also, there is not multiplication operation so the final stage is Addition (As this will lead to the answer hence no subtraction needed).

    =25.1
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