cathyangs
  • cathyangs
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
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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cathyangs
  • cathyangs
it can only have an addition sign and a subtraction sign, no brackets or anything. No powers, bases or anything like that either.
cathyangs
  • cathyangs
basically something you can do on a non-programming, elementary-school calculator
anonymous
  • anonymous
can you use the digits more than once?

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More answers

cathyangs
  • cathyangs
nope.
anonymous
  • anonymous
...Well, the closest I can get is 17+5-4=18 :/
cathyangs
  • cathyangs
XD that's how close I got.
saifoo.khan
  • saifoo.khan
We can use only + and - ?
cathyangs
  • cathyangs
yup, and you can only use each one time.
saifoo.khan
  • saifoo.khan
THinking..
cathyangs
  • cathyangs
I do so believe that this is the hardest third-grade question on openstudy...OTL
UnkleRhaukus
  • UnkleRhaukus
not possible
cathyangs
  • cathyangs
...ok... why? This is a "three-star" problem on a 3rd grader's hw...it's not possible?
anonymous
  • anonymous
Does it have to use ALL the digits and signs?
cathyangs
  • cathyangs
yes. the image is a calculator with all the keys you have to use once checked.
UnkleRhaukus
  • UnkleRhaukus
can you please check to see if the whole question has be written correctly
cathyangs
  • cathyangs
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 =.
anonymous
  • anonymous
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.
saifoo.khan
  • saifoo.khan
lol, same here.. i dont knw where to add 1. keep on gettinh 18.
cathyangs
  • cathyangs
it does't explicitly say, but all the other questions like that on the same sheet only use each digit once.
anonymous
  • anonymous
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. ):
saifoo.khan
  • saifoo.khan
might be a mis-print in the book?
cathyangs
  • cathyangs
it's not a book...but perhaps.

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