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Math Help - subtraction

  1. #1
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    subtraction

    To solve 159-73, a student writes the following equations:

    160-70=90-3=87-1=86

    Although the student has a good idea for solving the problem, his equations are not correct. In words, describe the student's solution strataegy and discuss why the strategy makes sense; then write a correct sequence of equations that correspond to this solution strategy. Write your equations in the following form

    159-73=some expression
    = some expression
    = :
    =86
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  2. #2
    Moo
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    Hello,

    Quote Originally Posted by recca View Post
    To solve 159-73, a student writes the following equations:

    160-70=90-3=87-1=86

    Although the student has a good idea for solving the problem, his equations are not correct. In words, describe the student's solution strataegy and discuss why the strategy makes sense; then write a correct sequence of equations that correspond to this solution strategy. Write your equations in the following form

    159-73=some expression
    = some expression
    = :
    =86
    Try this... ?

    159-73=160-1-73=160-70-3-1=160-70-4=90-4=86
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