Question

Which is the best estimate for (6.3x10-219.9x10-3written in scientific notation? 6x 10-4 60 x 10-5 6x107 60 x 108

Answer 1

The given product is

`(6.3*10^(-2))(9.9*10^(-3))`

To solve this multiplication, we multiply the coefficients between each other, and the power between each other.

`(6.3\cdot9.9)(10^(-2)\cdot10^(-3))=62.37*10^(-2-3)=62.37*10^(-5)`

Which is approximated to

`60*10^(-5)`

Therefore, the right answer is B.