Eddie Irwin works as a computer operator in the data processing department at Needham Medical Center. He is required to keep a weekly time card. What
are his hours for each day? What are his total hours for the week?

Explanation:

Use a marker to highlight the first three digits on the left. That would be the 7, 0 and 0.

The digit just to the right of that second "0" is the digit "9". Since this 9 is larger than 5, we'll bump the 7.00 up to 7.01

The 0 in 7.01 is significant because it's between two nonzero values. So we have three sig figs here.