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Math

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Evaluate the expression using mental math. Justify each of your steps.

1) 4(19)(-25)



2) 17+32+23

  • Math -

    Round: 4*20 is about 80, which multiplied by (20+5)=1600+400=2000 about, and it is negative.

    That is mental math.

  • Math -

    Thanks

  • Math -

    and I just saw a shortcut.

    take the 4 and 25 first, 100. then times 19, ....

    The problem with mental math is we see things with differing mental processes and perspectives, at differing times.

  • Math -

    32+16+8. Evalute the expression justify each of ur steps

  • Math -

    5ab

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