Verified answer

4,16×10⁸+9,11×10⁹=4,16×10⁸+91,1×10⁸=(4,16+91,1)×10⁸=95,26×10⁸=9,526×10⁹

5,3×10⁸+7,4×10¹⁰=5,3×10⁸+740×10⁸=(5,3+740)×10⁸=745,3×10⁸=7,453×10¹⁰