(4.29×1015)⋅(1.51×10−4)
Aziz is correct but there are some things you may need to know.
The computer symbol of power is ^ and the dot is a times sign *.
So this is how you need to enter it.
(4.29*10^15)*(1.51*10^-4)
oh and the site calc is on the home page.
This can be found by using the on-site calculator.