Math Help - Product

1. Product

Find Each Product.
1. (4x10^10)(2x10^-6) I multiplied 4x2 And Go 8. I kept 10 and just subtracted the exponents. and got 8x10 to the 4th power. Did I do It correct?

2. Better idea

What is $10^{10}$ x $10^{-6}$?

When you figure that part out, the rest is simple.