scientific notation

Question

Convert each number to scientific notation and multiply. Write your answer in scientific notation.
(72,000,000)(400,000,000)

Write 72,000.000 in scientific notation.
72,000,000=

Write 400,000,000 in scientific notation.
400,000,000=

Multiply.
(72,000,000) (4000,000,000)=

Answer 1

72,000,000 = 7.2*10⁷

400,000,000 = 4*10⁸

7.2*4=28.8=2.88*10 so total answer is 2.88*10⁷⁺⁸⁺¹=2.88*10¹⁶