Question

Find the product and express your answer in scientific notation. (1.3 x 10-6)(4 x 1010)

Answer 1

$(1.3\cdot10^{-6})(4\cdot10^{10})=(1.3\cdot4)(10^{-6}\cdot10^{10})=5.2\cdot10^{-6+10}\\\\=\boxed{5.2\cdot10^4}$