
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
According to the information from the Ministry of Transport, on the first day of the "May Day" holiday in 2023, the total number of operating passenger trips nationwide was approximately 56.99 million. Express 56.99 million in scientific notation as ______.

Present the answer in LaTex format: \boxed{Your answer}
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