Predict the result
Round zero point zero three seven nine two to the hundredths place.
Will the hundredths digit stay the same or increase?

Set up the model
The tenths digit is zero, the hundredths digit is three, and the next digit is seven.
Inspect the digit immediately to the right of the hundredths place.
Seven is at least five, so we round upward at the hundredths place.

Work the example
Increase the hundredths digit from three to four and remove the following digits.
Zero point zero three seven nine two rounds to zero point zero four at the hundredths place.
Use the approximation symbol, because the rounded value differs from the original.

Check the result
Now round seventy two point nine seven three to the tenths place.
Identify the tenths digit and the following hundredths digit.
Think before the answer appears.
[Eight-second silent pause to work; the answer remains hidden.]
The tenths digit is nine. The next digit, seven, causes rounding upward and a carry.
Nine tenths increases to ten tenths, so carrying gives seventy three point zero.
Seventy two point nine seven three rounds to seventy three point zero to the tenths place.
Keep the final zero to show the tenths place.

Interpret the result
Rounding gives an approximation at a named place.
Name the place, inspect the next digit, and carry when needed.
The zero in seventy three point zero identifies the requested tenths place.