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Director
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ROUNDING [#permalink] New post 03 Jun 2005, 01:31
Could anyone please explain the rules of rounding numbers? I screwed up on several questions because apparently my rounding techniques don't match ETS rounding.

Here how I do it, if it's 5 to 9 = > add 1
if 1-4, don't add one

so for example rounding 2.545 to tenth is 2.6
Senior Manager
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Re: ROUNDING [#permalink] New post 03 Jun 2005, 01:34
sparky wrote:
Could anyone please explain the rules of rounding numbers? I screwed up on several questions because apparently my rounding techniques don't match ETS rounding.

Here how I do it, if it's 5 to 9 = > add 1
if 1-4, don't add one

so for example rounding 2.545 to tenth is 2.6


Though the rule you have written here is correct...where if its from 5 to 9 you round up (that is, add 1) and if its 1-4 you round down, the example you have given contradicts the same rule

2.545 will be rounded to 2.5 as the number following the digit '5' is '4' which means round down to 2.5...only a number 2.55 or greater can be rounded to 2.6. Anything less will be rounded down to 2.5.

hope that helps
Director
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Re: ROUNDING [#permalink] New post 03 Jun 2005, 01:52
cloudz9 wrote:
sparky wrote:
Could anyone please explain the rules of rounding numbers? I screwed up on several questions because apparently my rounding techniques don't match ETS rounding.

Here how I do it, if it's 5 to 9 = > add 1
if 1-4, don't add one

so for example rounding 2.545 to tenth is 2.6


Though the rule you have written here is correct...where if its from 5 to 9 you round up (that is, add 1) and if its 1-4 you round down, the example you have given contradicts the same rule

2.545 will be rounded to 2.5 as the number following the digit '5' is '4' which means round down to 2.5...only a number 2.55 or greater can be rounded to 2.6. Anything less will be rounded down to 2.5.

hope that helps


Thanks,

but I previously thought that we need to round to the hundredth first so 2.545 becomes 2.55, and then to tenths, so 2.55 becomes 2.6. Apperently it's not right.
Senior Manager
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Re: ROUNDING [#permalink] New post 03 Jun 2005, 01:57
sparky wrote:
cloudz9 wrote:
sparky wrote:
Could anyone please explain the rules of rounding numbers? I screwed up on several questions because apparently my rounding techniques don't match ETS rounding.

Here how I do it, if it's 5 to 9 = > add 1
if 1-4, don't add one

so for example rounding 2.545 to tenth is 2.6


Though the rule you have written here is correct...where if its from 5 to 9 you round up (that is, add 1) and if its 1-4 you round down, the example you have given contradicts the same rule

2.545 will be rounded to 2.5 as the number following the digit '5' is '4' which means round down to 2.5...only a number 2.55 or greater can be rounded to 2.6. Anything less will be rounded down to 2.5.

hope that helps


Thanks,

but I previously thought that we need to round to the hundredth first so 2.545 becomes 2.55, and then to tenths, so 2.55 becomes 2.6. Apperently it's not right.


If the question asked you to round to the hundredth then it becomes 2.55...however when the question has asked only to round to the tenth, you only look at the number next to the tenth place.

A simple was to think about it is this:
from your example you are round 2.545 to the nearest tenth...thus it can either be 2.5 or 2.6...think about which side the number is closer to...its closer to 2.5...thus it become 2.5...(an exception is that if it is bang in the center...i.e. 2.55, then you have to round up)...

ONLY LOOK AT THE DIGIT NEXT TO THE DIGIT YOU ARE ROUNDING TO

Hope i didnt confuse you further :)
Senior Manager
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Re: ROUNDING [#permalink] New post 03 Jun 2005, 09:04
Thanks , I too had assumed that you had to round off the nearest hundreth and then to the nearest tenth.

HMTG.
Re: ROUNDING   [#permalink] 03 Jun 2005, 09:04
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