To be correct, you must look at the THIRD decimal and increase the second decimal by 1 up only if the third decimal is 5 or higher. Leave the second decimal as is when the third decimal is 4 or lower.
Examples:
12.28 = 12.28 because it was already expressed as 2 decimals.
12.284 = 12.28 (4 or less)
12.285 = 12.29
12.289 = 12.29
The basic principles of rounding are the same - no matter to how many digits you round.
Leave it as it is 1.55 which is already in two decimal places
11.25 is already two decimal places.
rounded to two decimal places after the decimal point: 6.73
Rounded to two decimal places, 3.8978 is approximately equal to 3.90.
Round it up - to 0.05
0.1717 rounded to two decimal places is 0.17
Leave it as it is 1.55 which is already in two decimal places
11.25 is already two decimal places.
It is already in two decimal places as 131.88
22.238 rounded to two decimal places is 22.34
2.3432 rounded to two decimal places is 2.34
3.441239 rounded to two decimal places is 3.44
7.439 rounded to two decimal places is 7.44
29.7054 rounded to two decimal places is 29.71
8.588 rounded to two decimal places is 8.59.
The number 400.55 is already rounded to two decimal places.
57.50% rounded to two decimal places = 0.58