30 rounding to the nearest ten

Rounding is based on if the number is greater than 5, if it is indeed greater than 5 it precedes to a higher number.

For instances, 37 rounds up to 40 or with smaller numbers 5 rounds to 10.

To address this question, 30 does not round up nor down, it remains as 30 because the ones place is less than 5.

To summarize

Round up when the ones place is 5 or higher Do not round if it is lower than 5 Ex: 37 - -> 40 Ex: 22 - -> 22