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.
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6.5- you round it until it has one decimal.
4.96432 rounded to 1 decimal place is 5.0.
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.
6.32 rounded to 1 decimal place = 6.3
It is 49.3 to 1 decimal place because .25 is rounded up to .3