When rounding off a number, take the following steps
1) decide to how many decimal places you want to round off
2) look at the next decimal. If this is a 0, 1, 2, 3 or 4, leave the last decimal as it is. If this is a 5, 6, 7, 8, 9, add 1 to the last decimal.
5.62984
To whole numbers: 6 To 3 decimal places: 5.630
To 1 decimal place: 5.6 To 4 decimal places: 5.6298
To 2 decimal places: 5.63