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use mental math and the distributive property to simplify 25(-99)and 19x21

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    Round the numbers so that they are easy to do you your head.

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    exsample for danny 25(-99) what is the answer thanks

  • math - ,

    What she is trying to say it, change the numbers into easier number that you can multipy in your head.

    Change -99 to -100

    Then the question would be 25(-100)
    which is equal to -2500

    but you added on a -25
    so now you you have to add on a positive 25;

    -2500+25=-2475

    That should be the right answer.

    Try doing the other one on your own.

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