15.8 Take the number after your desired decimal place. If it's 4 or lower, then the number at the desired decimal place stays the same (in this case, it stays .8). If it's 5 or higher, then the number at the desired decimal place raises by 1.
E.g. 15.869 rounded to 1 decimal place is 15.9.
E.g. 15.849 rounded to 1 decimal place is 15.8.
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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