As a physics and mathematics major, I have to say that I am completely deficient in my calculator abilities, i.e., I have not touched a calculator since freshman year. With that said, I must also say that I am not very good at cranking out pure numbers, but here's are some tips for getting what you need on this test. First of all, if you notice that the numbers all differ in the first digit, then only compute the first digit of the computation, i.e., do whatever it takes to minimize your computations. Second, use g=10 for gravity, and round all ugly numbers. And third, express everything in scientific notation. For example, write .1 as 1 x 10^-1. That will minimize errors.
hope this helps!