In this Cyberchase video clip, Harry uses an online photo of one fourth of Times Square to estimate the number of people there on New Year's Eve. Using his computer, Harry puts a grid with 50 squares on top of the photo. Since some of the squares are buildings, while others are filled with people, Harry picks a square in the middle to use for his starting point. The square, which is not completely filled with people, has 2,000 people in it. Harry multiplies 2,000 by 50 and gets 100,000 people. Since the photo only shows one fourth of the area, he multiples this result by four for a final estimate of 400,000 people.