needing help with simplifying -25 divided by 6 plus 4 1/5
- Thread starter TaraKay
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This? \(\displaystyle \L\;\frac{-25}{6\;+\;4\frac{1}{5}}\)? That's really ugly. We really cannot tell you what you are doing wrong if you don't tell us what you are doing.
Get rid of the silly mixed fractions. The are good for almost nothing except visual comparisons.
\(\displaystyle \L\;4\frac{1}{5}\;=\; \frac{20}{5}+\frac{1}{5}\;=\;\frac{21}{5}\)
That leaves us with this.
\(\displaystyle \L\;\frac{-25}{6\;+\;\frac{21}{5}}\)
Add things in the denominator
\(\displaystyle \L\;6\;+\;\frac{21}{5}\;=\;\frac{30}{5}+\frac{21}{5}\;=\;\frac{51}{5}\)
Now we're down to:
\(\displaystyle \L\;\frac{-25}{(\frac{51}{5})}\)
That's the same as:
\(\displaystyle \L\;(-25) *\frac{5}{51}\)
Okay. You either take it from there or tell me I'm working the wrong problem because you actually meant \(\displaystyle \L\;\frac{-25}{6}\;+\;4\frac{1}{5}\).
Get rid of the silly mixed fractions. The are good for almost nothing except visual comparisons.
\(\displaystyle \L\;4\frac{1}{5}\;=\; \frac{20}{5}+\frac{1}{5}\;=\;\frac{21}{5}\)
That leaves us with this.
\(\displaystyle \L\;\frac{-25}{6\;+\;\frac{21}{5}}\)
Add things in the denominator
\(\displaystyle \L\;6\;+\;\frac{21}{5}\;=\;\frac{30}{5}+\frac{21}{5}\;=\;\frac{51}{5}\)
Now we're down to:
\(\displaystyle \L\;\frac{-25}{(\frac{51}{5})}\)
That's the same as:
\(\displaystyle \L\;(-25) *\frac{5}{51}\)
Okay. You either take it from there or tell me I'm working the wrong problem because you actually meant \(\displaystyle \L\;\frac{-25}{6}\;+\;4\frac{1}{5}\).
The page we are working on is called Order of operations with rational numbers. I do not know how to get the computer to show the dividing sign and that is why I wrote it out. But the problem is- Negitive 25 divided by 6 plus 4 and 1/5. The book says that the answer is 1/30 and no matter how I do it I can't come up with that answer. Sorry I didn't make myself clear, hope it is better now.
skeeter
Elite Member
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- Dec 15, 2005
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tkh will be happy to know it was his 2nd thought regarding the expression ...
\(\displaystyle \L -25 \div 6 + 4\frac{1}{5}\)
do the division first ... \(\displaystyle \L -25 \div 6 = -4\frac{1}{6}\)
\(\displaystyle \L -4\frac{1}{6} + 4\frac{1}{5} = \frac{1}{5} - \frac{1}{6} = \frac{6}{30} - \frac{5}{30} = \frac{1}{30}\)
\(\displaystyle \L -25 \div 6 + 4\frac{1}{5}\)
do the division first ... \(\displaystyle \L -25 \div 6 = -4\frac{1}{6}\)
\(\displaystyle \L -4\frac{1}{6} + 4\frac{1}{5} = \frac{1}{5} - \frac{1}{6} = \frac{6}{30} - \frac{5}{30} = \frac{1}{30}\)
Thank you very much. I just could not get it to come out right and now I know what I did wrong. About using / as a dividing sign how would you know if i meant it as a fraction? I could not find the dividing sign on my keyboard, how did you guys get it?
