
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
Mira wants to add 63 and 48, then subtract 21 from the result, and finally round the outcome to the nearest hundred. She decided to round each number to the nearest tens before the operations, subtracting, and rounding again. Determine the exact final result without initial intermediate rounding.

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