Since 22 is considerably closer to 20 than 30, it would be rounded to 20.
Work Step by Step
A number line can be used to help round numbers to the nearest ten. In this example, numbers less than five would be rounded to 20 as they are closer to 20 as opposed to 30. However, numbers five or greater would be rounded to 30 as they are closer to 30 as opposed to 20.