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