The '9' is in the "first decimal" place and the '3' is in the "second decimal" place.
Rules for rounding
As the problem in this case is 3.93 and the number in the second decimal place is less than 5, we end up with
3.9 "correct to one decimal place" or "rounded to one decimal place".
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3.3 rounded to 1 decimal place is 3.0.
Go to the second decimal place; if it is less than 5; round down. If it is 5 or greater, round up. So, 1.51 rounded to 1 decimal place is 1.5.
To one decimal place it is rounded to 0.9
Well, isn't that a happy little question! When we round 6.45 to 1 decimal place, we look at the digit in the second decimal place, which is 5. Since 5 is 5 or greater, we round up the first decimal place to 6. So, 6.45 rounded to 1 decimal place is 6.5.
1.9