
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
The National Medical Insurance Administration announced that the total settlement of the new coronavirus vaccine and vaccination fees in China from 2021 to 2022 is approximately 150 billion yuan. Express the number 1500 in scientific notation as ______.

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