6 grade math

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Please I just need help on the set up teacher wants a guess and check table.

Thomas is thinking of a number. If he doubles his number and subtraction 27, the results is 407. Of what number is Thomas thinking?

  • 6 grade math -

    So we know that the result of doubling a number and subtracting 27 gives 407. Since your teacher wants a guess and check table, let's just start guessing numbers around the 200 mark, since we know double the number at some point.

  • 6 grade math -

    no need for guessing, just reverse the steps:

    the first thing we did was multiply by 2, then subtract 27 to get 407
    So everything done in reverse:

    ( 407+27) divide by 2
    = 434 รท 2
    = 217

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