0
If you are rounding to 100ths it is 1.73 . If you are rounding to 10ths it is 1.7 . If you are rounding to integers it is 2 .
The depends to what decimal place you are rounding the number.
Rounding numbers is easy because their are two rules to rounding numbers.
1) a </= 4 then a = 0
2) a >/= 5 then a = 10
8.25
3.21