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tjcrace
tjcrace asks:
Q:

What 2 numbers can you subtract, using the numerals 3, 4, 7, 8, 9, & 9, to produce a difference of 4.25?

In Topics: Helping my child with school work and home work, Helping my child with math
> 60 days ago

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pigtoria
pigtoria writes:
Hi Tjcrace....

The numbers that you've listed are all whole numbers.  When whole numbers are added, subtracted, or multiplied  it will always give a result of whole numbers and not a decimal value.  A whole number divided by a whole number could give a decimal value answer.  Maybe part of the question is missing.  Perhaps you can rewrite your question so that we could help you.

Vicki
> 60 days ago

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chemteacher
chemteacher writes:
What a great, and difficult, question. I hope the questions is asking you to use these numerals as digits in numbers, and arrange them to find 4.25. If that is the case, they would need to be in fractions. The only way to get 4.25 would be if the final answer, after reducing, was 4 1/4.
Here's how I did it, working backwards from the answer:
First, I know that 4.25 = 4 1/4. Since the 3 and 4 jumped out at me as the denominators (3 x 4 = 12), that would make the unreduced answer 51/12.
From there I tried different combinations of the 7, 8, 9, and 9 in the numerators. After trying a few, I found that 87/3 minus 99/4 would work.
Here's how: 87/3 = 348/12 and 99/4 = 297/12.
Solving for 87/3 - 99/4 = 348/12 - 297/12 = 51/12.
Reducing 51/12, you get 17/4 (both numbers are divisible by 3).
This further reduces to 4 1/4 = 4.25.

This was tough, but very interesting!
> 60 days ago

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