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
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The basic principles of rounding are the same - no matter to how many digits you round.
11.25 is already two decimal places.
To round 1.55 to two decimal places, you need to look at the third decimal place, which is 5 in this case. Since 5 is equal to or greater than 5, you round up the second decimal place by adding 1 to it. Therefore, 1.55 rounded to two decimal places is 1.56.
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