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November 01, 2025, 10:12:21 am
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Author Topic: Rounding  (Read 4611 times)  Share 

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smithy16

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Rounding
« on: October 31, 2011, 08:22:41 pm »
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What is the Further Maths rule for rounding. Say if a question asked me to round up to 1 decimal place, and the answer i got was 12.8456.
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MJRomeo81

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Re: Rounding
« Reply #1 on: October 31, 2011, 08:30:06 pm »
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You typically don't round until the final answer is needed. A good thing to do on the Classpad 330 is to fix the number of decimal places before calculating. You can do this in the menu (icon next to edit -> basic format -> number format -> fix 1).

For 12.8456, to 1 d.c. -> 12.8
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Re: Rounding
« Reply #2 on: October 31, 2011, 09:42:50 pm »
+1
Quote from: MJRomeo81 on October 31, 2011, 08:30:06 pm
A good thing to do on the Classpad 330 is to fix the number of decimal places before calculating. You can do this in the menu (icon next to edit -> basic format -> number format -> fix 1).

For 12.8456, to 1 d.c. -> 12.8

make sure you change it back for other subjects though, you dont want to think an answer is an exact value since its given to 1 dp place in spesh.
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davidle_10

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Re: Rounding
« Reply #3 on: November 01, 2011, 12:22:58 am »
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If there are questions that follow from the one that requires rounding, do you use the rounded answer or the unrounded answer in the calculations?
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iroflmfao

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Re: Rounding
« Reply #4 on: November 01, 2011, 08:54:59 am »
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unrounded .
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smithy16

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Re: Rounding
« Reply #5 on: November 03, 2011, 04:18:41 pm »
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I just put it at fix 4, just to be safe. And if i need to find the exact number, ill just change it to fix 1. Thanks so much!
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some dude

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Re: Rounding
« Reply #6 on: November 03, 2011, 04:22:08 pm »
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yes put it on fix. ive found that when doing trig, even if you hav it set to like FLOAT 6 sometimes it rounds it off to 2 decimal places, dont know if its just me does anyone else hav this problem?... so yeah FIX 4 works best for me
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Bigkev93

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Re: Rounding
« Reply #7 on: November 03, 2011, 05:27:51 pm »
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what is the difference between fix 4 and float 12?
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xdecay

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Re: Rounding
« Reply #8 on: November 03, 2011, 05:32:32 pm »
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i don't know about the technical aspect of using the calculator either..
i'm doing trigonometry, graphs and relations and matrices.
what setting should i put my CAS calculator?

it's currently DEG AUTO REAL and float 8.
what does this even mean?
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vgardiy

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Re: Rounding
« Reply #9 on: November 03, 2011, 05:42:10 pm »
+1
fix 4 means it will always give 4 decimal places, whereas float 12 will give 12 digits (so it includes those before a decimal point) where necessary.

DEG AUTO REAL refers to
Angle type (Degrees or radians), not sure about AUTO, REAL gives real number solutions (as opposed to imaginary ones (i think imaginary is only spesh))

float 8 means 8 digits.
« Last Edit: November 03, 2011, 05:43:41 pm by vgardiy »
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ZakHi

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Re: Rounding
« Reply #10 on: November 03, 2011, 05:43:43 pm »
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Never change it from DEG when doing trig, i got like 1/30 in a prac exam simpley because it wasnt in DEG and all the answers coming up on my calc were wrongg, always have DEG on!!!
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xdecay

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Re: Rounding
« Reply #11 on: November 03, 2011, 05:56:14 pm »
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oh thank you so much for the explanations! made my life so much easier. was panicking for a bit back then. :P
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Re: Rounding
« Reply #12 on: November 03, 2011, 06:28:58 pm »
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Quote from: ZakHi on November 03, 2011, 05:43:43 pm
Never change it from DEG when doing trig, i got like 1/30 in a prac exam simpley because it wasnt in DEG and all the answers coming up on my calc were wrongg, always have DEG on!!!

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Re: Rounding
« Reply #13 on: November 03, 2011, 08:02:48 pm »
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no no you have to use radians
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xdecay

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Re: Rounding
« Reply #14 on: November 03, 2011, 08:57:56 pm »
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we never use radians in further.
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