To add 9km² and 56m², we need to convert one of the units to match the other.

1 km² is equal to 1,000,000 m².

So, 9 km² is equal to 9 * 1,000,000 = 9,000,000 m².

Now we can add 9,000,000 m² and 56 m²:

9,000,000 m² + 56 m² = 9,000,056 m²