It is: 2.7
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Rounding to 1 decimal place (1.d.p) is 1.2Also known as rounding to the nearest hundredth
To round 4.21 to 1 decimal place, you look at the digit in the second decimal place, which is 1. Since 1 is less than 5, you keep the digit in the first decimal place the same, which is 2. Therefore, rounding 4.21 to 1 decimal place gives you 4.2.
34.8You don't walk the rounding from the right to the left as in34.849 -> 34.85 -> 34.9
From where I'm sitting, it appears as if "10.5" is already written with one decimal place, and so does not require any further rounding to that degree of precision.
Oh, dude, 2.98 to 1 decimal place is 3.0. It's like rounding up your bill at a restaurant - just a fancy way of saying "close enough." So, if you're not into those extra decimal points, just round it up and call it a day.