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Math Help - subtraction

  1. #1
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    subtraction

    Tylishia says that she can solve 324-197 by adding 3 to both numbers and solving 327-200 instead

    a draw a number line (which needs not be perfectly to scale) to help you explain why Tylishia's method is valid.

    b. Explain in another way why Tylishia's method is valid.

    C. Could you adapt Tylishia's method to other subtraction problems, such as to the problem 183-49? If so, give at least two more examples and show how to apply Tylishia's method in each case.

    Thank you
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  2. #2
    Moo
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    Quote Originally Posted by recca View Post
    Tylishia says that she can solve 324-197 by adding 3 to both numbers and solving 327-200 instead

    a draw a number line (which needs not be perfectly to scale) to help you explain why Tylishia's method is valid.

    b. Explain in another way why Tylishia's method is valid.

    C. Could you adapt Tylishia's method to other subtraction problems, such as to the problem 183-49? If so, give at least two more examples and show how to apply Tylishia's method in each case.

    Thank you
    Hello,

    For the first one :

    subtraction-numbers.jpg

    What can you conclude ?



    For the second one :

    What does it mean "add 3 to each number" ?

    What you're asked is if (324+3)-(197+3)=324-197
    Study the LHS by removing the parenthesis (and don't forget the - sign)
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  3. #3
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    Help

    I do not understand
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  4. #4
    Moo
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    You can see on the line that the distance between 324 and 197 is the same as 327 and 200.
    So the difference is equal.

    Question 2. :

    (324+3)-(197+3)=324+3-197-3=324-197+3-3=324-197
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