Whats 12.949 rounded to one decimal place

[Clarissaintheway]

........?

Isn’t it 13, because when it’s a an odd number followed by 5 you round up? So 12.95 gets rounded up to 13.0

It's an odd number followed by a 4.

You can't just ignore the 9 at the end. First you need to round it to two decimals, which is 12.95. Then you round it to one decimal, which means rounding up to 13.0.

I looked at the 12.949 as 13 too JellyBabies

Starting at the far left, the 9 rounds the 4 to 5 and the 5 rounds the 0.9 to 1.0

But it's a l-o-n-g time since I did classroom maths.

No you don't. You only ever look at the next number.

12.3491785680284 - you wouldn't start at the far right!! It would just be 12.3

The first question is 13. If the last decimal is 5 or above you round up

12.949 =
12.95 =
13

You can just ignore the 9 at the end, because it denotes a number less than 0.05. Otherwise the cut off point for rounding up would be 4.5, not 5.

You're rounding to 1 decimal place, not to the whole number.

Best Rubbish.

12.9

You can't round up and then round up again.

You look at the next number along (4), which is the decider.
5 or more, raise the score, 4 or less, let it rest.

So the 9 in the first decimal place stays the same.

12.9

• I mean, you need to round to 1d.p.

you wouldn't start at the far right!!
Why not?

Can all the people who don't know what they are talking about, please stop giving wrong answers!

12.949 is nearer to 12.9 than it is to 13.0, which is why, when rounding to 1dp it goes to 12.9

The rule if exactly mid way is to go up. But you can't round up and then round up again.

Best because that is incorrect. You are rounding to one decimal. So you only look at the decimal after it. If you wanted
12.782614 rounded to three decimal places you would look at the fourth and then see what the third would be.
So 12.783

One decimal place = 12.9

One significant figure = 13

Why isn't the teacher doing the marking?!

WTF 1 sig fig would be 10 (though I don't think you'd ever really do that), 13 would be 2 sig fig or more helpfully nearest integer.

Each decimal place is 10 times smaller than the one before, therefore they are too small to count, so you only look to one decimal place before the one you are rounding to.

Peer group marking is much quicker. Everyone swaps books, tesch3r calls out answers and students tick or cross. Saves them sitting going through 30 books.

It's prone to challenges, see above, so I'd imagine there is an element of self checking when the books are given back.

To the people saying start far right, would you round 12.9444445 to 13?

TeenTimesTwo Yes, of course. D'Oh! 😳

To round to one decimal place, you look ONLY at the second decimal place.

12.1
x=3

If you want to try it out, open Excel, set the numbering to one decimal place, and input the figure. The answer is 12.9

sizzle I hope that's a typo.