which-step-is-incorrect-in-subtracting-25-x-108-from-60-x-109

Question

Which step is incorrect in subtracting 2.5 x $$10^{8}$$ from 6.0 x $$10^{9}$$?

Accepted Answer

Adjust 6.0 x $$10^{9} to $$match the smaller exponent.

Answer

Subtract the coefficients 6.0 and 0.25.

Answer

Adjust 2.5 x $$10^{8} to 0.25 x$$ $$10^{9}.$$

Answer

Result is 5.75 x $$10^{8}.$$

Which step is incorrect in subtracting 2.5 x 108 from 6.0 x 109?