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  1. #1
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    algorithm

    PROJECT: CREATING AN ALGORITHM

    Imagine working with a younger sibling or student who is having trouble multiplying by 9s. Create an algorithm to help the student learn how to do this easily. Then notate whether the given algorithm is equivalent or not. You may need to use outside resources to help you.
    Hint: 10 - 1 = 9
    Describe your algorithm in the space provided below.
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  2. #2
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    Quote Originally Posted by manznitaa5 View Post
    PROJECT: CREATING AN ALGORITHM

    Imagine working with a younger sibling or student who is having trouble multiplying by 9s. Create an algorithm to help the student learn how to do this easily. Then notate whether the given algorithm is equivalent or not. You may need to use outside resources to help you.
    Hint: 10 - 1 = 9
    Describe your algorithm in the space provided below.
    Do you mean something like this(?):

    Let 1 \leq a \leq 10

    Then the result of a \cdot 9 is a 2-digit-number whose

    first digit is a-1 and it's

    second digit is 9-first\ digit

    Example: 5 \cdot 9

    first digit: 5-1=\boxed{4}
    second digit: 9-4=\boxed{5}

    and therefore the result is 45
    Last edited by earboth; July 17th 2008 at 04:21 AM. Reason: found a typo
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by manznitaa5 View Post
    PROJECT: CREATING AN ALGORITHM

    Imagine working with a younger sibling or student who is having trouble multiplying by 9s. Create an algorithm to help the student learn how to do this easily. Then notate whether the given algorithm is equivalent or not. You may need to use outside resources to help you.
    Hint: 10 - 1 = 9
    Describe your algorithm in the space provided below.
    Multiply by 10 by adding a 0 to the left end of the string of digits representing the number, then suntract the original number from this new number.

    RonL
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