The answer is 4.2 - If the number in the NEXT column to where you're rounding to is 5 or greater, you round UP. If it's 4 or less, you round DOWN.
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6.5- you round it until it has one decimal.
2.21 rounded to one decimal place = 2.2
3.91 rounded off to one decimal place = 3.9
21.99 rounded to one decimal place
To round 34.4 to one decimal place, you look at the digit in the second decimal place, which is 4. Since 4 is less than 5, you simply drop all the digits after the first decimal place, resulting in 34.4 rounded to one decimal place.