To calculate \( 6.25 \times 10^6 - 4.73 \times 10^6 \):
- Since both terms have the same power of ten, we can subtract their coefficients directly:
\[ (6.25 - 4.73) \times 10^6 \]
- Now, perform the subtraction of the coefficients:
\[ 6.25 - 4.73 = 1.52 \]
- Therefore, we can rewrite the expression as:
\[ 1.52 \times 10^6 \]
- The final result, expressed in scientific notation to two decimal places, is:
\[ \boxed{1.52 \times 10^6} \]