Oh, dude, rounding is like the easiest math concept ever. So, 2.975 to one decimal place would be 3.0. You just look at the number after the first decimal place, which is 7, and since it's more than 5, you round up the first decimal place to 3.0. Easy peasy!
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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.