0.44 square kilometers. According to life experience and understanding of area units and data size, we can know that Tiananmen Square in Beijing is the largest square in the world. Using area units and data, we can know that "hectare" should be used as the unit; 1 hectare =0.0 1 km2. Tiananmen Square in Beijing is the largest square in the world, covering an area of 44 hectares, equivalent to 0.44 square kilometers.

Tiananmen Square is located in the center of Beijing. It is 880 meters long from north to south and 500 meters wide from east to west, covering an area of 440,000 square meters. It can accommodate 654.38 million people for a grand party. Along the central axis of Beijing, the national flagpole, the Monument to the People's Heroes, the Chairman Mao Memorial Hall and the Zhengyangmen Gate Tower stand in the square from north to south.

Tiananmen Square is a palace square outside the main entrance of the Forbidden City in Beijing. There are fences on the east, west and south sides, and ordinary people are forbidden to enter. The square starts from Tiananmen Square in the north, Zhengyangmen in the south, the History Museum in the east and the Great Hall of the People in the west. It is 880 meters long from north to south and 500 meters wide from east to west, covering an area of 440,000 square meters.