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cathyangs

  • 2 years ago

Please help an 8-year-old! (it's not me) Using only the digits 1, 4, 5, and 7, and one addition sign, and one subtraction sign, find a way to get the answer 19. ex: 57-1+4

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  1. cathyangs
    • 2 years ago
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    it can only have an addition sign and a subtraction sign, no brackets or anything. No powers, bases or anything like that either.

  2. cathyangs
    • 2 years ago
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    basically something you can do on a non-programming, elementary-school calculator

  3. shelovespiano
    • 2 years ago
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    can you use the digits more than once?

  4. cathyangs
    • 2 years ago
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    nope.

  5. shelovespiano
    • 2 years ago
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    ...Well, the closest I can get is 17+5-4=18 :/

  6. cathyangs
    • 2 years ago
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    XD that's how close I got.

  7. saifoo.khan
    • 2 years ago
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    We can use only + and - ?

  8. cathyangs
    • 2 years ago
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    yup, and you can only use each one time.

  9. saifoo.khan
    • 2 years ago
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    THinking..

  10. cathyangs
    • 2 years ago
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    I do so believe that this is the hardest third-grade question on openstudy...OTL

  11. UnkleRhaukus
    • 2 years ago
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    not possible

  12. cathyangs
    • 2 years ago
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    ...ok... why? This is a "three-star" problem on a 3rd grader's hw...it's not possible?

  13. Tiamat
    • 2 years ago
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    Does it have to use ALL the digits and signs?

  14. cathyangs
    • 2 years ago
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    yes. the image is a calculator with all the keys you have to use once checked.

  15. UnkleRhaukus
    • 2 years ago
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    can you please check to see if the whole question has be written correctly

  16. cathyangs
    • 2 years ago
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    it is. here is the exact phrasing: Below each calculator, write a number sentence to give the answer shown. The symbols and digits to use are checked on each calculator. the answer is 19. The digits and symbols are 1, 4, 5, 7, -, + and =.

  17. Tiamat
    • 2 years ago
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    Wait, if that's the exact question, then does it say in the -directions- to use everything once? If so, then I have to agree with UnkleRhaukus. I can only get as far as 18 with these numbers.

  18. saifoo.khan
    • 2 years ago
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    lol, same here.. i dont knw where to add 1. keep on gettinh 18.

  19. cathyangs
    • 2 years ago
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    it does't explicitly say, but all the other questions like that on the same sheet only use each digit once.

  20. Tiamat
    • 2 years ago
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    Ahhhh. This is making my brain hurt. Either it's a type of trick question where you do use them more than once, like: 17 + 5 - 4 + 1 = 19 Or a typo. I'm sorry, I just can't figure this one out. ):

  21. saifoo.khan
    • 2 years ago
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    might be a mis-print in the book?

  22. cathyangs
    • 2 years ago
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    it's not a book...but perhaps.

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