Rounding decimals.

dadofkent · Post by **dadofkent** » Fri Jul 10, 2009 12:22 am

Tonight's maths question. Can you please round the below number to 2 decimal places. A number of replies would be appreciated.

3.25487

Thanks.

Post by **hermanmunster** » Fri Jul 10, 2009 12:24 am

3.25

ow got something in my eye

dadofkent · Post by **dadofkent** » Fri Jul 10, 2009 12:29 am

hermanmunster wrote:3.25

ow got something in my eye

Thankyou Hermanmunster. I am up against a year 5 top set maths teacher, not to mention a wife, who say you round from the right, and not from the left, and which would give a value of 3.26.

SSM · Post by **SSM** » Fri Jul 10, 2009 12:30 am

That's what I would have said, but then thought is it a trick question and is the answer 3.26.

Post by **hermanmunster** » Fri Jul 10, 2009 12:51 am

that's the trouble with Herman's method - I don;t round from any direction so the remaining 0.487 is less than half hence the rounded sum would be 3.25.

ho hum.

Snowdrops · Post by **Snowdrops** » Fri Jul 10, 2009 12:54 am

I would have said 3.26 too.

KenR · Post by **KenR** » Fri Jul 10, 2009 7:56 am

3.26

I was always taught to round from the right iteratively

The Excel ROUND function however thinks it's 3.25 but I think it's wrong.

=ROUND(3.25487,2)

Ken

SunlampVexesEel · Post by **SunlampVexesEel** » Fri Jul 10, 2009 8:31 am

3.25487

Rounded to 2 dp is 3.25

Imagine a number line... 4 is less than 5.. clearly rounds down.

Moving from the right, accumulating 'rounding' is clearly bogus.

Bexley Mum 2 · Post by **Bexley Mum 2** » Fri Jul 10, 2009 8:40 am

I would say 3.26 too.

Just1-2go · Post by **Just1-2go** » Fri Jul 10, 2009 8:43 am

My year 6 son says 3.25