Question

All of the questions

Answer 1

All these can be done without a calculator by taking the factors of ten separately.  We count zeros for the exponents.

$770,000,000 / 1,100 = \dfrac{ 77 \times 10^7 }{11 \times 10^2} = 7 \times 10^5 = 700,000$

$3,900,000,000 / 13,000 = \dfrac{39 \times 10^8}{13 \times 10^3} = 3 \times 10^5 = 300,000$
I'll leave the rest for you or someone else, sorry.