To calculate \( 6.25 \times 10^6 - 4.73 \times 10^6 \), we can first factor out the common \( 10^6 \):
\[ 6.25 \times 10^6 - 4.73 \times 10^6 = (6.25 - 4.73) \times 10^6 \]
Now, perform the subtraction:
\[ 6.25 - 4.73 = 1.52 \]
Now, we can express the result in scientific notation:
\[ 1.52 \times 10^6 \]
Since \( 1.52 \) is already in the correct format and we need to express it to two decimal places, our final answer is:
\[ \boxed{1.52 \times 10^6} \]