To round .1428571429 to one decimal place, we look at the digit in the tenths place, which is 1. Since the digit immediately to the right (4) is less than 5, we do not need to round up. Therefore, the number remains as .1 when rounded to one decimal place.
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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.