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EnerJen
Newbie
Joined: 14 Jul 2004
Posts: 7
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 Posted: 25 Jan 2005 01:45:47 am Post subject: |
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1) How do you find the LCM of fractions using the lcm function?
lcm (15, 45) gives 45 but what about fractions?
I could do, for example lcm (5.2,7), which gives me 182, or lcm (5.1,7.2) which gives 612/5
But the problem if I type in decimal formats I can't cover the scope of all rational numbers, for example, 1/9
I tried typing in lcm ((xx/xx),(xx/xx)) but it doesn't work (xx just stands for a number of 2 digits. I could solve it by hand but using a calc would be more convinient.
2) How do you convert repeated decimals into fractions using the calc? I know on the TI-83 if you goto Math -----> Frac and you type in enough digits it will transform the decimal into a improper fraction.
Ex. .18181818181818..... <--- Convert this into a fraction
How do you do it on the 89?
Last edited by Guest on 25 Jan 2005 01:46:39 am; edited 1 time in total |
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Jeremiah Walgren
General Operations Director
Know-It-All
Joined: 24 May 2003
Posts: 1937
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| Posted: 26 Jan 2005 01:15:48 am Post subject: |
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1) Taken from the online manual (Appendix A, section L) at TI's site:
"Returns the least common multiple of the two arguments. The lcm of two fractions is the lcm of their numerators divided by the gcd of their denominators. The lcm of fractional floating-point numbers is their product."
As for your decimal problems, try converting to easy fractions or something. 5.1 could be 51/10 or something similar. I really don't understand what your problem is... Sorry.
2) Put your calculator into exact mode and enter the decimal into the command line. Press enter and it should be converted into a fraction. |
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DarkerLine
ceci n'est pas une |
Super Elite (Last Title)
Joined: 04 Nov 2003
Posts: 8328
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| Posted: 26 Jan 2005 07:13:21 pm Post subject: |
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2) Or you can do exact(number,tolerance)
Edit: could someone move this to the ti-basic topic please?
Last edited by Guest on 26 Jan 2005 07:14:05 pm; edited 1 time in total |
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sgm
Calc Guru
Joined: 04 Sep 2003
Posts: 1265
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| Posted: 27 Jan 2005 04:21:06 pm Post subject: |
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Sir Robin wrote: Edit: could someone move this to the ti-basic topic please?
Your wish is my command. |
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