The rule when rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1".
As the first figure to be discarded is '6' and this is more than 5 then the previous figure '1' is increased by 1.
To one decimal place 5.164 is 5.2
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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
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.
To round 10.99557429 to one decimal place, you look at the digit in the tenths place, which is the second digit after the decimal point. In this case, the digit in the tenths place is 9. Since 9 is greater than or equal to 5, you round up the digit in the tenths place to the next higher number. Therefore, rounding 10.99557429 to one decimal place gives you 11.0.