To round 8.24 to 1 decimal place

1
To round 8.24 to 1 decimal place
... decide which two decimals it lies between ..
8.2
8.3
... 8.24 is nearer to 8.2.
(the first decimal place is in blue (2) use the
next digit to decide how to round)
8.24 rounded to 1 decimal place is 8.2
2
To round 4.15 to 1 decimal place
... decide which two decimals it lies between ..
4.1
4.2
... 4.15 is half way.
If its half way we always round up.
4.15 rounded to 1 decimal place is 4.2
3
To round 7.63 to 1 decimal place
3 is less than 5 (half way) so round down
7.63 rounded to 1 decimal place is 7.6
To round 16.79 to 1 decimal place
9 is greater than 5 (half way) so round up
16.79 rounded to 1 decimal place is 16.8
4
To round 2.781 to 2 decimal places
1 is less than 5 (half way) so round down
2.781 rounded to 2 decimal places is 2.78
To round 0.816 to 2 decimal place
6 is greater than 5 (half way) so round up
0.816 rounded to 2 decimal places is 0.82