Math

Winnies friend marco guessed that her riddle was about the number 79 Why can't 79 be the answer to Winnies riddle

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  1. If you think about this question:

    Winnie wrote the following riddle:
    I am a number between 60 and 100.
    My ones digit is two less than my tens digit.
    I am a prime number.

    Part A
    What number does Winnie’s riddle describe?
    Explain.

    Part B
    Winnie’s friend Marco guessed that her riddle was about the number 79.
    Why can’t 79 be the answer to Winnie’s riddle?
    Explain.

    Then:

    Part A

    The digit in the tens place must be 6, 7, 8, or 9.

    So the number must be:

    64
    becouse oness digit 4 is two less than tens digit 6

    75
    becouse oness digit 5 is two less than tens digit 7

    86
    becouse oness digit 6 is two less than tens digit 8

    and

    97
    becouse oness digit 7 is two less than tens digit 9

    Since 64 and 86 are even, they are divisible by 2.

    Since 75 has a 5 in the ones place it is divisible by 5.

    So 64, 75, and 86 are not a prime numbers.

    Since the only factors of 97 are 1 and 97, 97 is a prime number.

    Part B

    Although 79 is a prime number between 60 and 100, the ones digit is two more than the tens digit.

    The ones digit should be two less than the tens digit.

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  2. This helped me with my homework soooo much I'm studying for a test to so thanks for giving an explanation because now I get it and I will know how to do it on the test. Thank you for the help and also do you go to " Hawkins Elementary school" byyyyyyyeeeee. Also just because, HIT OR MISS!!!!!!!!!!!!!!

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  3. The answers were the right one thank you

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  4. tanks a lot I was struggling to help my sister o d this problem but you made it easy

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  5. Oh my gosh, at first I was struggling with this problem and you made it a whole lot easier! Other websites didn't explain it so I'm very glad to see this! Good job and keep up the good work.

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  6. I still don't get it how do you know the digits in the the tens place has to be 6, 7, 8, 9, ?

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  7. I am trying to do a test!

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