Question

Find the product of 21 and (6.3 x 10^-4)

Answer 1

$21\cdot(6.3\cdot10^{-4})=21\cdot6.3\cdot10^{-4}=132.3\cdot10^{-4}=1.323\cdot10^{-4+2}=1.323\cdot10^{-2}\\\\or\ other\ form\ 132.3\cdot10^{-4}=0.01323$