My daughter asked me to go over her homework. Today's lesson covered operations with fractions. After going through the work manually, we took out our calculators to check the work. I do most of my work on my 50G, but chose my 35s since it is so easy to enter/calculate/display fractions.
We looked at the following problem: 1/5 + 3 7/8 (that is one fifth plus three and seven eights).
Our manual solution was 3 3/40.
However, the 35s came out with 3 1/13.
Naturally, this wasn't a good thing with my 10 year old daughter watching. So, we did the same calculation on her Smartcalc 300s. The 300s confirmed our manual result. I then entered the calculation as an equation on my 50g, it came back with the same answer as the 300s.
So, how come the 35s came back with a different solution? I must be making some stupid mistake (it has been a long day!). Or, is this some display setting with fractions on the 35s?
--Tod
Checking my daughter's homework
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05-12-2009, 06:59 PM
05-12-2009, 07:23 PM
Sorry, it has been a long day. The answer(s) are 4 3/40 or 4 1/13.
05-12-2009, 07:30 PM
You've probably (accidentally) set a small maximum denominator via the /c command. Try 100 /c and see what result it gives. 0 /c should reset to maximum. Remember the 35s doesn't do real fraction like the 48 series.
Edited: 12 May 2009, 7:32 p.m.
05-12-2009, 07:31 PM
Your answer should be 4 3/40 On the HP50g one enters 5 1/x then 3 7 8 / + PROPFRAC PROPFRAC Edited: 14 May 2009, 7:54 p.m.
05-12-2009, 07:50 PM
Yes, that was the answer. Thanks for the fast response.
05-13-2009, 07:06 AM
There are two (easy to overlook) indicators to the right, showing up when the true result is smaller or larger than the fraction shown. Edited: 13 May 2009, 7:06 a.m. |
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